Import MSL headers and files

src/MSL_C.PPCEABI.bare.H/mbstring.c

@@ -0,0 +1,18 @@
+#include "PowerPC_EABI_Support/Msl/MSL_C/MSL_Common/mbstring.h"
+
+size_t wcstombs(char* s, const wchar_t* pwcs, size_t n)
+{
+	wchar_t next;
+	size_t chars_written;
+	int i;
+
+	chars_written = 0;
+	for (i = 0; i < n; ++i) {
+		next = *pwcs++;
+		*s++ = (char)next;
+		if ((char)next == '\0')
+			break;
+		++chars_written;
+	}
+	return chars_written;
+}