Match MSL_C (#8)

* match wstring.c

* match math_api.c, mbstring.c, mem.c and mem_funcs.c

* more progress

* build issues

* fix non-matching issues

* reorganise files

* match fdlibm (+ libc progress)

* fix jp build

* solved some non-matchings and progress

* removed types.h usage in libc

* match data and add missing delinks for jp

libs/c/include/wstring.h

@@ -0,0 +1,19 @@
+#ifndef _C_WSTRING_H
+#define _C_WSTRING_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+size_t wcslen(const wchar_t *str);
+wchar_t *wcscpy(wchar_t *dest, const wchar_t *src);
+wchar_t *wcsncpy(wchar_t *dest, const wchar_t *src, size_t n);
+const wchar_t *wcschr(const wchar_t *str, wchar_t chr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif