POSIX.xs: Add locks to libc functions missing them

Use these new macros to assure thread safety

Author: khwilliamson

ext/POSIX/POSIX.xs

@@ -1742,7 +1742,9 @@ fix_win32_tzenv(void)
         newenv = (char*)malloc((strlen(perl_tz_env) + 4) * sizeof(char));
         if (newenv != NULL) {
             sprintf(newenv, "TZ=%s", perl_tz_env);
+            PERL_PUTENV_LOCK;
             _putenv(newenv);
+            PERL_PUTENV_UNLOCK;
             if (oldenv != NULL)
                 free(oldenv);
             oldenv = newenv;
@@ -3390,7 +3392,9 @@ strtol(str, base = 0)
     PPCODE:
         CHECK_AND_WARN_PROBLEMATIC_LOCALE_;
 	if (base == 0 || inRANGE(base, 2, 36)) {
+            PERL_STRTOL_LOCK;
             num = strtol(str, &unparsed, base);
+            PERL_STRTOL_UNLOCK;
 #if IVSIZE < LONGSIZE
             if (num < IV_MIN || num > IV_MAX)
                 PUSHs(sv_2mortal(newSVnv((NV)num)));
@@ -3425,7 +3429,9 @@ strtoul(str, base = 0)
 	PERL_UNUSED_VAR(base);
         CHECK_AND_WARN_PROBLEMATIC_LOCALE_;
 	if (base == 0 || inRANGE(base, 2, 36)) {
+            PERL_STRTOUL_LOCK;
             num = strtoul(str, &unparsed, base);
+            PERL_STRTOUL_UNLOCK;
 #if UVSIZE < LONGSIZE
             if (num > UV_MAX)
                 PUSHs(sv_2mortal(newSVnv((NV)num)));
@@ -3663,7 +3669,9 @@ cuserid(s = 0)
 	char *		s = 0;
     CODE:
 #ifdef HAS_CUSERID
+  PERL_CUSERID_LOCK;
   RETVAL = cuserid(s);
+  PERL_CUSERID_UNLOCK;
 #else
   PERL_UNUSED_VAR(s);
   RETVAL = 0;

ext/POSIX/lib/POSIX.pm

@@ -4,7 +4,7 @@ use warnings;
 
 our ($AUTOLOAD, %SIGRT);
 
-our $VERSION = '2.25';
+our $VERSION = '2.26';
 
 require XSLoader;