(multiple): Include stdint.h

Some headers and source files have been using types such as uint32_t
without explicitly including stdint.h.

Explicitly include stdint.h where appropriate.

Signed-off-by: Yong Bakos <ybakos@humanoriented.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/scanner.c

@@ -31,6 +31,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdint.h>
 #include <string.h>
 #include <errno.h>
 #include <ctype.h>