decode_prometheus: fix 64-bit timestamp parsing for Windows

Windows (even 64-bit!) uses an LLP64 data model where long int is still only 32-bits...

Signed-off-by: Stewart Webb <[email protected]>

src/cmt_decode_prometheus.c

@@ -200,7 +200,7 @@ static int parse_uint64(const char *in, uint64_t *out)
     int64_t val;
 
     errno = 0;
-    val = strtol(in, &end, 10);
+    val = strtoll(in, &end, 10);
     if (end == in || *end != 0 || errno)  {
         return -1;
     }