Check for PHP_WIN32 instead of _MSC_VER

Co-authored-by: Niels Dossche <7771979+nielsdos@users.noreply.github.com>

Author: TimWolla

Diff for: ext/hash/php_hash_sha.h

@@ -46,7 +46,7 @@ typedef struct {
 PHP_HASH_API void PHP_SHA256InitArgs(PHP_SHA256_CTX *, ZEND_ATTRIBUTE_UNUSED HashTable *);
 PHP_HASH_API void PHP_SHA256Update(PHP_SHA256_CTX *, const unsigned char *, size_t);
 
-#ifdef PHP_WIN32
+#ifdef _MSC_VER
 # define PHP_STATIC_RESTRICT
 #else
 # define PHP_STATIC_RESTRICT static restrict