link to upstream merged PR for pledge, drop test bits

sysutils/xxhash/patches/patch-cli_xsum_os_specific_c

@@ -1,4 +1,5 @@
 Use pledge(2), xxhsum(1) only ever reads files or stdin.
+merged https://github.com/Cyan4973/xxHash/pull/880
 
 Index: cli/xsum_os_specific.c
 --- cli/xsum_os_specific.c.orig

sysutils/xxhash/patches/patch-tests_sanity_test_c

@@ -1,19 +0,0 @@
-Use pledge(2), the sanity test does even not read files.
-
-Index: tests/sanity_test.c
---- tests/sanity_test.c.orig
-+++ tests/sanity_test.c
-@@ -639,6 +639,13 @@ int main(int argc, const char* argv[])
-     (void) argc;
-     (void) argv;
- 
-+#ifdef __OpenBSD__
-+    if (pledge("stdio", NULL) == -1) {
-+        XSUM_log("pledge: %s\n", strerror(errno));
-+        return EXIT_FAILURE;
-+    }
-+#endif
-+
-     {
-         /* XXH32 */
-         size_t const n = sizeof(XSUM_XXH32_testdata) / sizeof(XSUM_XXH32_testdata[0]);