wrap stdint.h include in HAVE_STDINT_H

make the indenting a little more consistent too..

Fixes Solaris 2.6; reported by Tom G. Christensen
diff --git a/channels.c b/channels.c
index 47521d3..0f45aee 100644
--- a/channels.c
+++ b/channels.c
@@ -59,7 +59,7 @@
 #include <netdb.h>
 #include <stdarg.h>
 #ifdef HAVE_STDINT_H
- #include <stdint.h>
+# include <stdint.h>
 #endif
 #include <stdio.h>
 #include <stdlib.h>