Clang16 will not allow implicit library functions by default
and therefore this test would fail because the function
exit() from stdlib.h is used. We need to include stdlib.h
in this test.
This patch needs to run _before_ eautoreconf.

Bug: https://bugs.gentoo.org/870535
PR to merge this upstream: https://github.com/juddmon/jpilot/pull/50

Pascal Jäger <pascal.jaeger@leimstift.de> (2022-12-10)

--- a/configure.in
+++ b/configure.in
@@ -331,7 +331,10 @@ CFLAGS="$CFLAGS $PILOT_FLAGS"
 save_LIBS="$LIBS"
 LIBS="$LIBS $PILOT_LIBS"
 
-AC_TRY_COMPILE([#include <pi-version.h>], [
+AC_TRY_COMPILE([
+#include <stdlib.h>
+#include <pi-version.h>
+], [
    exit(0);
 ], ,
  AC_MSG_ERROR([pilot-link header pi-version.h not found])