Sync build system #if/ifdef/defined

These are either undefined or defined to value 1:
- HAVE_CRYPT
- HAVE_CRYPT_H
- HAVE_UNISTD_H

Follow up of phpGH-5526 (-Wundef)

Author: petk

ext/standard/config.m4

@@ -68,19 +68,19 @@ if test "$PHP_EXTERNAL_LIBCRYPT" != "no"; then
 
   AC_CACHE_CHECK(for standard DES crypt, ac_cv_crypt_des,[
     AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if HAVE_UNISTD_H
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#if HAVE_CRYPT_H
+#ifdef HAVE_CRYPT_H
 #include <crypt.h>
 #endif
 
 #include <stdlib.h>
 #include <string.h>
 
 int main(void) {
-#if HAVE_CRYPT
+#ifdef HAVE_CRYPT
 	char *encrypted = crypt("rasmuslerdorf","rl");
 	return !encrypted || strcmp(encrypted,"rl.3StKT.4T8M");
 #else
@@ -96,19 +96,19 @@ int main(void) {
 
   AC_CACHE_CHECK(for extended DES crypt, ac_cv_crypt_ext_des,[
     AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if HAVE_UNISTD_H
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#if HAVE_CRYPT_H
+#ifdef HAVE_CRYPT_H
 #include <crypt.h>
 #endif
 
 #include <stdlib.h>
 #include <string.h>
 
 int main(void) {
-#if HAVE_CRYPT
+#ifdef HAVE_CRYPT
 	char *encrypted = crypt("rasmuslerdorf","_J9..rasm");
 	return !encrypted || strcmp(encrypted,"_J9..rasmBYk8r9AiWNc");
 #else
@@ -124,19 +124,19 @@ int main(void) {
 
   AC_CACHE_CHECK(for MD5 crypt, ac_cv_crypt_md5,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if HAVE_UNISTD_H
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#if HAVE_CRYPT_H
+#ifdef HAVE_CRYPT_H
 #include <crypt.h>
 #endif
 
 #include <stdlib.h>
 #include <string.h>
 
 int main(void) {
-#if HAVE_CRYPT
+#ifdef HAVE_CRYPT
 	char salt[15], answer[40];
 	char *encrypted;
 
@@ -162,19 +162,19 @@ int main(void) {
 
   AC_CACHE_CHECK(for Blowfish crypt, ac_cv_crypt_blowfish,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if HAVE_UNISTD_H
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#if HAVE_CRYPT_H
+#ifdef HAVE_CRYPT_H
 #include <crypt.h>
 #endif
 
 #include <stdlib.h>
 #include <string.h>
 
 int main(void) {
-#if HAVE_CRYPT
+#ifdef HAVE_CRYPT
 	char salt[30], answer[70];
 	char *encrypted;
 
@@ -197,19 +197,19 @@ int main(void) {
 
   AC_CACHE_CHECK(for SHA512 crypt, ac_cv_crypt_sha512,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if HAVE_UNISTD_H
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#if HAVE_CRYPT_H
+#ifdef HAVE_CRYPT_H
 #include <crypt.h>
 #endif
 
 #include <stdlib.h>
 #include <string.h>
 
 int main(void) {
-#if HAVE_CRYPT
+#ifdef HAVE_CRYPT
 	char salt[21], answer[21+86];
 	char *encrypted;
 
@@ -231,19 +231,19 @@ int main(void) {
 
   AC_CACHE_CHECK(for SHA256 crypt, ac_cv_crypt_sha256,[
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
-#if HAVE_UNISTD_H
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
-#if HAVE_CRYPT_H
+#ifdef HAVE_CRYPT_H
 #include <crypt.h>
 #endif
 
 #include <stdlib.h>
 #include <string.h>
 
 int main(void) {
-#if HAVE_CRYPT
+#ifdef HAVE_CRYPT
 	char salt[21], answer[21+43];
 	char *encrypted;