main, res, tests: Fix compilation errors on FreeBSD.

asterisk.c, manager.c: Increase buffer sizes to avoid truncation warnings.
config.c: Include header file for WIFEXITED/WEXITSTATUS macros.
res_timing_kqueue: Use more portable format specifier.
test_crypto: Use non-linux limits.h header file.

Resolves: #916

tests/test_crypto.c

@@ -41,7 +41,7 @@
 
 #include <assert.h>
 #include <sys/stat.h>
-#include <linux/limits.h>
+#include <limits.h>
 #include <openssl/evp.h>
 
 static const char *keypair1 = "rsa_key1";