fixed compilation warnings on big endian system

Author: vibhutisawant

ext/ffi/ffi_parser.c

@@ -313,7 +313,7 @@ static int get_skip_sym(void) {
 	int ch;
 	int ret;
 	int accept = -1;
-	const unsigned char *accept_pos;
+	const unsigned char *accept_pos = NULL;
 	const unsigned char *cpos = yy_pos;
 	const unsigned char *cend = yy_end;
 

ext/intl/collator/collator_is_numeric.c

@@ -69,7 +69,7 @@ static double collator_u_strtod(const UChar *nptr, UChar **endptr) /* {{{ */
 		char buf[64], *numbuf, *bufpos;
 		size_t length = u - nstart;
 		double value;
-		ALLOCA_FLAG(use_heap);
+		ALLOCA_FLAG(use_heap = 0);
 
 		if (length < sizeof(buf)) {
 			numbuf = buf;