Fix warnings trivial warnings.

Fix warnings about:
 . Unused variables
 . format mismatch in printf/scanf format string and arguments
 . Missing parenthesis around assignment as truth values
 . Clang warnings anout unknown GCC pragma

lib/librmt/rmtlib.c

@@ -626,12 +626,13 @@ remdev(const char *path)
 int
 rmtopen(const char *path, int oflag, ...)
 {
-	mode_t mode;
+	/* LSC: MINIX  This works only for int mode flags, so use the expected type. */	
+	uint32_t mode;
 	int fd;
 	va_list ap;
 	va_start(ap, oflag);
 
-	mode = va_arg(ap, mode_t);
+	mode = va_arg(ap, uint32_t);
 	va_end(ap);
 
 	_DIAGASSERT(path != NULL);