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

@@ -93,11 +93,13 @@
 $add amd64
 $endif
 
 SYMBOL_VERSION ILLUMOS_0.8 {    # POSIX 2008 newlocale and friends
     protected:
+        __global_locale;
         __mb_cur_max;
+        __mb_cur_max_l;
         btowc_l;
         duplocale;
         fgetwc_l;
         freelocale;
         getwc_l;