[SystemZ][z/OS] Missing non-posix functions libc++

[muiez]

Summary

The aim is to add missing non-posix functions for z/OS libc++ (strtod_l and strtof_l).

[zibi]

This LGTM from my end.
@ldionne can we get your approval?

[muiez]

Ping :)

[muiez]

PS: I do not have commit access. May someone commit the patch? Thanks
The author is: Muiez Ahmed

libcxx/include/__support/ibm/xlocale.h

 
 // The following are not POSIX routines.  These are quick-and-dirty hacks
 // to make things pretend to work
 static inline
 long long strtoll_l(const char *__nptr, char **__endptr,
     int __base, locale_t locale) {
   return strtoll(__nptr, __endptr, __base);
 }
+
 static inline
 long strtol_l(const char *__nptr, char **__endptr,
     int __base, locale_t locale) {
   return strtol(__nptr, __endptr, __base);
 }
+
+static inline
+double strtod_l(const char *__nptr, char **__endptr,
+    locale_t locale) {
+  return strtod(__nptr, __endptr);
+}
+
+static inline
+float strtof_l(const char *__nptr, char **__endptr,
+    locale_t locale) {
+  return strtof(__nptr, __endptr);
+}
+
 static inline
 long double strtold_l(const char *__nptr, char **__endptr,
     locale_t locale) {
   return strtold(__nptr, __endptr);
 }
+
 static inline
 unsigned long long strtoull_l(const char *__nptr, char **__endptr,
     int __base, locale_t locale) {
   return strtoull(__nptr, __endptr, __base);
 }
+
 static inline
 unsigned long strtoul_l(const char *__nptr, char **__endptr,
     int __base, locale_t locale) {
   return strtoul(__nptr, __endptr, __base);
 }
 
 static inline
 int vasprintf(char **strp, const char *fmt, va_list ap)