Fix compile errors, code review feedback, and add basic libc test suite.

*** 46,96 ****
  #ifndef _LOCALE_T
  #define _LOCALE_T
  typedef struct locale *locale_t;
  #endif
  
! int mbsinit_l(const mbstate_t *, locale_t);
  
! size_t mbsrtowcs_l(wchar_t *_RESTRICT_KYWD, const char **_RESTRICT_KYWD,
      size_t, mbstate_t *_RESTRICT_KYWD, locale_t);
  
! size_t mbsnrtowcs_l(wchar_t *_RESTRICT_KYWD, const char **_RESTRICT_KYWD,
      size_t, size_t, mbstate_t *_RESTRICT_KYWD, locale_t);
  
! char *strptime_l(const char *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
      struct tm *_RESTRICT_KYWD, locale_t);
  
! int wcwidth_l(wchar_t, locale_t);
  
! int wcswidth_l(const wchar_t *, size_t, locale_t);
  
! int iswspecial_l(wint_t, locale_t);
! int iswnumber_l(wint_t, locale_t);
! int iswhexnumber_l(wint_t, locale_t);
! int iswideogram_l(wint_t, locale_t);
! int iswphonogram_l(wint_t, locale_t);
  
! wint_t btowc_l(int, locale_t);
! int wctob_l(wint_t, locale_t);
! size_t mbrtowc_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD, size_t,
      mbstate_t *_RESTRICT_KYWD, locale_t);
! size_t mbstowcs_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD, size_t,
      locale_t);
! int mblen_l(const char *, size_t, locale_t);
! size_t mbrlen_l(const char *_RESTRICT_KYWD, size_t, mbstate_t *_RESTRICT_KYWD,
!     locale_t);
! int mbtowc_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD, size_t,
!     locale_t);
! size_t wcsrtombs_l(char *_RESTRICT_KYWD, const wchar_t **_RESTRICT_KYWD,
      size_t len, mbstate_t *_RESTRICT_KYWD, locale_t);
! size_t wcrtomb_l(char *_RESTRICT_KYWD, wchar_t, mbstate_t *_RESTRICT_KYWD,
!     locale_t);
! size_t wcstombs_l(char *_RESTRICT_KYWD, const wchar_t *_RESTRICT_KYWD, size_t,
!     locale_t);
! int wctomb_l(char *, wchar_t, locale_t);
  
! unsigned char __mb_cur_max_l(locale_t);
  #ifndef MB_CUR_MAX_L
  #define MB_CUR_MAX_L(l) (__mb_cur_max_l(l))
  #endif
  
  
--- 46,96 ----
  #ifndef _LOCALE_T
  #define _LOCALE_T
  typedef struct locale *locale_t;
  #endif
  
! extern int mbsinit_l(const mbstate_t *, locale_t);
  
! extern size_t mbsrtowcs_l(wchar_t *_RESTRICT_KYWD, const char **_RESTRICT_KYWD,
      size_t, mbstate_t *_RESTRICT_KYWD, locale_t);
  
! extern size_t mbsnrtowcs_l(wchar_t *_RESTRICT_KYWD, const char **_RESTRICT_KYWD,
      size_t, size_t, mbstate_t *_RESTRICT_KYWD, locale_t);
  
! extern char *strptime_l(const char *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
      struct tm *_RESTRICT_KYWD, locale_t);
  
! extern int wcwidth_l(wchar_t, locale_t);
  
! extern int wcswidth_l(const wchar_t *, size_t, locale_t);
  
! extern int iswspecial_l(wint_t, locale_t);
! extern int iswnumber_l(wint_t, locale_t);
! extern int iswhexnumber_l(wint_t, locale_t);
! extern int iswideogram_l(wint_t, locale_t);
! extern int iswphonogram_l(wint_t, locale_t);
  
! extern wint_t btowc_l(int, locale_t);
! extern int wctob_l(wint_t, locale_t);
! extern size_t mbrtowc_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
!     size_t, mbstate_t *_RESTRICT_KYWD, locale_t);
! extern size_t mbstowcs_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
!     size_t, locale_t);
! extern int mblen_l(const char *, size_t, locale_t);
! extern size_t mbrlen_l(const char *_RESTRICT_KYWD, size_t,
      mbstate_t *_RESTRICT_KYWD, locale_t);
! extern int mbtowc_l(wchar_t *_RESTRICT_KYWD, const char *_RESTRICT_KYWD, size_t,
      locale_t);
! extern size_t wcsrtombs_l(char *_RESTRICT_KYWD, const wchar_t **_RESTRICT_KYWD,
      size_t len, mbstate_t *_RESTRICT_KYWD, locale_t);
! extern size_t wcrtomb_l(char *_RESTRICT_KYWD, wchar_t,
!     mbstate_t *_RESTRICT_KYWD, locale_t);
! extern size_t wcstombs_l(char *_RESTRICT_KYWD, const wchar_t *_RESTRICT_KYWD,
!     size_t, locale_t);
! extern int wctomb_l(char *, wchar_t, locale_t);
  
! extern unsigned char __mb_cur_max_l(locale_t);
  #ifndef MB_CUR_MAX_L
  #define MB_CUR_MAX_L(l) (__mb_cur_max_l(l))
  #endif
  
  
*** 97,108 ****
  #if defined(_XPG4) && !defined(_FILEDEFED) || __cplusplus >= 199711L
  #define _FILEDEFED
  typedef __FILE FILE;
  #endif
  
! wint_t fgetwc_l(FILE *, locale_t);
! wint_t getwc_l(FILE *, locale_t);
  
  #ifndef getwchar_l
  #define getwchar_l(l)   fgetwc_l(stdin, (l))
  #endif
  
--- 97,108 ----
  #if defined(_XPG4) && !defined(_FILEDEFED) || __cplusplus >= 199711L
  #define _FILEDEFED
  typedef __FILE FILE;
  #endif
  
! extern wint_t fgetwc_l(FILE *, locale_t);
! extern wint_t getwc_l(FILE *, locale_t);
  
  #ifndef getwchar_l
  #define getwchar_l(l)   fgetwc_l(stdin, (l))
  #endif