Correct static build for extension

* Fix PHP version detection
  * `phpize`; check the version with `php-config`
  * PHP `./configure` static build; use $PHP_VERSION

Author: Skunnyk

ext/config.m4

@@ -2,8 +2,20 @@ PHP_ARG_WITH(cassandra, Enable Cassandra extension,
 [  --with-cassandra[=DIR]    Enable the Cassandra extension.])
 
 AC_MSG_CHECKING([for supported PHP version])
-PHP_CASSANDRA_FOUND_PHP_VERSION=`${PHP_CONFIG} --version`
+if test -z "$PHP_VERSION"; then
+  if test -z "$PHP_CONFIG"; then
+    AC_MSG_ERROR([php-config not found])
+  fi
+  PHP_CASSANDRA_FOUND_PHP_VERSION=`$PHP_CONFIG --version`
+else
+  PHP_CASSANDRA_FOUND_PHP_VERSION="$PHP_VERSION"
+fi
+
 PHP_CASSANDRA_FOUND_PHP_VERSION_NUMBER=`echo "${PHP_CASSANDRA_FOUND_PHP_VERSION}" | $AWK 'BEGIN { FS = "."; } { printf "%d", ([$]1 * 100 + [$]2) * 100 + [$]3;}'`
+if test -z "$PHP_CASSANDRA_FOUND_PHP_VERSION_NUMBER"; then
+  AC_MSG_ERROR([failed to detect PHP version, please report])
+fi
+
 if test "$PHP_CASSANDRA_FOUND_PHP_VERSION_NUMBER" -lt "50600"; then
   AC_MSG_ERROR([not supported. PHP version 5.6.0+ required (found $PHP_CASSANDRA_FOUND_PHP_VERSION)])
 else

ext/php_driver.h

@@ -460,6 +460,8 @@ php5to7_string_compare(php5to7_string s1, php5to7_string s2)
 
 extern zend_module_entry php_driver_module_entry;
 
+#define phpext_cassandra_ptr &php_driver_module_entry
+
 PHP_MINIT_FUNCTION(php_driver);
 PHP_MSHUTDOWN_FUNCTION(php_driver);
 PHP_RINIT_FUNCTION(php_driver);