nga-c: include stdint.h

FossilOrigin-Name: acf4dbeadd2cea4c7fd55d58f2b0cdde5b5d64171fe4bda1554d1baf82371381

RELEASE-NOTES

@@ -30,6 +30,7 @@
     (Arland Childers)
   - retro-repl.c now uses an external image
   - removed barebones.c (overlaps w/new retro-repl.c)
+  - retro-runtime.c now based on standard retro.c
 
 - nga-nim
 

vm/nga-c/retro-runtime.c

@@ -15,6 +15,7 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <signal.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

vm/nga-c/retro.c

@@ -15,6 +15,7 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <signal.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>