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/src/wstring.c

@@ -0,0 +1,53 @@
+#include <wstring.h>
+
+size_t wcslen(const wchar_t *str) {
+    size_t len = -1;
+
+    do {
+        len++;
+    } while (*str++ != 0);
+
+    return len;
+}
+
+wchar_t *wcscpy(wchar_t *dest, const wchar_t *src) {
+    const wchar_t *p = src;
+    wchar_t *q       = dest;
+
+    while ((*q++ = *p++) != L'\0')
+        ;
+
+    return dest;
+}
+
+wchar_t *wcsncpy(wchar_t *dest, const wchar_t *src, size_t n) {
+    const wchar_t *p = src;
+    wchar_t *q       = dest;
+
+    n++;
+
+    while (--n != 0) {
+        if ((*q++ = *p++) == 0) {
+            while (--n != 0) {
+                *q++ = 0;
+            }
+            break;
+        }
+    }
+
+    return dest;
+}
+
+const wchar_t *wcschr(const wchar_t *str, wchar_t chr) {
+    const wchar_t *p = str;
+    wchar_t c        = chr;
+    wchar_t ch;
+
+    while (ch = *p++) {
+        if (ch == c) {
+            return ((char *) (p - 1));
+        }
+    }
+
+    return (c ? 0 : (char *) (p - 1));
+}