use thread_local for ntoa buf

@@ -420,10 +420,12 @@
 CCERRWARN=              -xwe
 
 # C standard.  Keep Studio flags until we get rid of lint.
 CSTD_GNU89=     -xc99=%none
 CSTD_GNU99=     -xc99=%all
+# Made up for cw
+CSTD_GNU11=     -xc11=%all
 CSTD=           $(CSTD_GNU89)
 C99LMODE=       $(CSTD:-xc99%=-Xc99%)
 
 # In most places, assignments to these macros should be appended with +=
 # (CPPFLAGS.first allows values to be prepended to CPPFLAGS).