dlopen-test: Use libnettle.dylib on MacOS.

ChangeLog

+2019-09-15  Niels Möller  <nisse@lysator.liu.se>
+
+	* testsuite/dlopen-test.c (main): Use libnettle.dylib on MacOS.
+
 2019-07-08  Niels Möller  <nisse@lysator.liu.se>
 
 	* nettle-types.h (union nettle_block16): Mark w member as deprecated.

testsuite/dlopen-test.c

@@ -5,11 +5,17 @@
 #include <dlfcn.h>
 #endif
 
+#ifdef __APPLE__
+#define SO_EXT "dylib"
+#else
+#define SO_EXT "so"
+#endif
+
 int
 main (int argc UNUSED, char **argv UNUSED)
 {
 #if HAVE_LIBDL
-  void *handle = dlopen ("../libnettle.so", RTLD_NOW);
+  void *handle = dlopen ("../libnettle." SO_EXT, RTLD_NOW);
   int (*get_version)(void);
   if (!handle)
     {