add ABI compat aliases for a number of locale_t functions

src/locale/duplocale.c

 #include <stdlib.h>
 #include <string.h>
 #include "locale_impl.h"
+#include "libc.h"
 
 locale_t duplocale(locale_t old)
 {
@@ -9,3 +10,5 @@ locale_t duplocale(locale_t old)
 	if (new && old != LC_GLOBAL_LOCALE) memcpy(new, old, sizeof *new);
 	return new;
 }
+
+weak_alias(duplocale, __duplocale);

src/locale/freelocale.c

 #include <stdlib.h>
 #include "locale_impl.h"
+#include "libc.h"
 
 void freelocale(locale_t l)
 {
 	free(l);
 }
+
+weak_alias(freelocale, __freelocale);

src/locale/iswctype_l.c

 #include <wctype.h>
+#include "libc.h"
 
 int iswctype_l(wint_t c, wctype_t t, locale_t l)
 {
 	return iswctype(c, t);
 }
+
+weak_alias(iswctype_l, __iswctype_l);

src/locale/newlocale.c

 #include <stdlib.h>
 #include <string.h>
 #include "locale_impl.h"
+#include "libc.h"
 
 locale_t newlocale(int mask, const char *name, locale_t base)
 {
@@ -9,3 +10,5 @@ locale_t newlocale(int mask, const char *name, locale_t base)
 	if (!base) base = calloc(1, sizeof *base);
 	return base;
 }
+
+weak_alias(newlocale, __newlocale);

src/locale/towlower_l.c

 #include <wctype.h>
+#include "libc.h"
 
 wint_t towlower_l(wint_t c, locale_t l)
 {
 	return towlower(c);
 }
+
+weak_alias(towlower_l, __towlower_l);

src/locale/towupper_l.c

 #include <wctype.h>
+#include "libc.h"
 
 wint_t towupper_l(wint_t c, locale_t l)
 {
 	return towupper(c);
 }
+
+weak_alias(towupper_l, __towupper_l);

src/locale/uselocale.c

 #include "locale_impl.h"
 #include "pthread_impl.h"
+#include "libc.h"
 
 locale_t uselocale(locale_t l)
 {
@@ -8,3 +9,5 @@ locale_t uselocale(locale_t l)
 	if (l) self->locale = l;
 	return old;
 }
+
+weak_alias(uselocale, __uselocale);

src/locale/wctype_l.c

 #include <wctype.h>
+#include "libc.h"
 
 wctype_t wctype_l(const char *s, locale_t l)
 {
 	return wctype(s);
 }
+
+weak_alias(wctype_l, __wctype_l);