more locale_t interfaces (string stuff) and header updates

this should be everything except for some functions where the non-_l
version isn't even implemented yet (mainly some non-ISO-C wcs*
functions).

src/locale/strcasecmp_l.c

@@ -0,0 +1,7 @@
+#include <strings.h>
+#include <ctype.h>
+
+int strcasecmp_l(const char *l, const char *r, locale_t loc)
+{
+	return strcasecmp(l, r);
+}