Remove some unused variables

- Variables php_abs_top_srcdir php_abs_top_builddir are no longer used.
- ZEND_EXT_TYPE is always zend_extension and variable is no longer used.

Closes GH-4378

Author: petk

build/Makefile.global

@@ -80,7 +80,7 @@ PHP_TEST_SHARED_EXTENSIONS =  ` \
 	fi; \
 	if test "x$(PHP_ZEND_EX)" != "x"; then \
 		for i in $(PHP_ZEND_EX)""; do \
-			. $$i; $(top_srcdir)/build/shtool echo -n -- " -d $(ZEND_EXT_TYPE)=$(top_builddir)/modules/$$dlname"; \
+			. $$i; $(top_srcdir)/build/shtool echo -n -- " -d zend_extension=$(top_builddir)/modules/$$dlname"; \
 		done; \
 	fi`
 PHP_DEPRECATED_DIRECTIVES_REGEX = '^(magic_quotes_(gpc|runtime|sybase)?|(zend_)?extension(_debug)?(_ts)?)[\t\ ]*='

configure.ac

@@ -165,9 +165,6 @@ test -z "$CFLAGS" && auto_cflags=1
 abs_srcdir=`(cd $srcdir; pwd)`
 abs_builddir=`pwd`
 
-php_abs_top_srcdir=$abs_srcdir
-php_abs_top_builddir=$abs_builddir
-
 dnl Because `make install` is often performed by the superuser, we create the
 dnl libs subdirectory as the user who configures PHP. Otherwise, the current
 dnl user will not be able to delete libs or the contents of libs.
@@ -1381,8 +1378,6 @@ PHP_SUBST(EXT_LIBS)
 
 PHP_SUBST_OLD(abs_builddir)
 PHP_SUBST_OLD(abs_srcdir)
-PHP_SUBST_OLD(php_abs_top_builddir)
-PHP_SUBST_OLD(php_abs_top_srcdir)
 
 PHP_SUBST(bindir)
 PHP_SUBST(sbindir)
@@ -1458,9 +1453,6 @@ if test "$PHP_WERROR" = "yes"; then
   CPPFLAGS="$CPPFLAGS -Werror"
 fi
 
-ZEND_EXT_TYPE="zend_extension"
-PHP_SUBST(ZEND_EXT_TYPE)
-
 dnl
 dnl Libtool creation.
 dnl

scripts/phpize.m4

@@ -111,10 +111,6 @@ php_zts_is_enabled
 CPPFLAGS=$old_CPPFLAGS
 AC_MSG_RESULT([$PHP_THREAD_SAFETY])
 
-dnl Support for building and testing Zend extensions.
-ZEND_EXT_TYPE="zend_extension"
-PHP_SUBST(ZEND_EXT_TYPE)
-
 dnl Discard optimization flags when debugging is enabled.
 if test "$PHP_DEBUG" = "yes"; then
   PHP_DEBUG=1