adapt compat_kex_proposal() test to portable

Author: djmdjm

Makefile.in

@@ -616,6 +616,7 @@ regress/unittests/conversion/test_conversion$(EXEEXT): \
 UNITTESTS_TEST_KEX_OBJS=\
 	regress/unittests/kex/tests.o \
 	regress/unittests/kex/test_kex.o \
+	regress/unittests/kex/test_proposal.o \
 	$(SKOBJS)
 
 regress/unittests/kex/test_kex$(EXEEXT): ${UNITTESTS_TEST_KEX_OBJS} \

regress/unittests/kex/test_proposal.c

@@ -5,14 +5,18 @@
  * Placed in the public domain
  */
 
+#include "includes.h"
+
 #include <sys/types.h>
 #include <signal.h>
 #include <stdio.h>
+#ifdef HAVE_STDINT_H
 #include <stdint.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 
-#include "test_helper.h"
+#include "../test_helper/test_helper.h"
 
 #include "compat.h"
 #include "ssherr.h"