common/fs.c: use rb mode on fopen() to fix behavior on windows

src/common/fs.c

@@ -7,7 +7,7 @@
 
 char *read_file(const char *path)
 {
-	FILE *file = fopen(path, "r");
+	FILE *file = fopen(path, "rb");
 	if (!file) {
 		perror("fopen");
 		return NULL;