Remove unused build variables (#12746)

- LFLAGS
- PHP_LIBS
- SHARED_LIBTOOL
- EXT_LIBS

These were part of the build system in the past and are no longer used
in current code.

configure.ac

@@ -1516,8 +1516,6 @@ PHP_SUBST(PHP_BINARIES)
 PHP_SUBST(PHP_MODULES)
 PHP_SUBST(PHP_ZEND_EX)
 
-PHP_SUBST(EXT_LIBS)
-
 PHP_SUBST_OLD(abs_builddir)
 PHP_SUBST_OLD(abs_srcdir)
 
@@ -1556,20 +1554,17 @@ PHP_SUBST_OLD(ZEND_EXTRA_LIBS)
 PHP_SUBST_OLD(INCLUDES)
 PHP_SUBST_OLD(EXTRA_INCLUDES)
 PHP_SUBST_OLD(INSTALL_IT)
-PHP_SUBST(LFLAGS)
 PHP_SUBST(LIBTOOL)
 PHP_SUBST(LN_S)
 PHP_SUBST_OLD(NATIVE_RPATHS)
 PHP_SUBST_OLD(PEAR_INSTALLDIR)
 PHP_SUBST_OLD(PHP_LDFLAGS)
-PHP_SUBST_OLD(PHP_LIBS)
 PHP_SUBST(OVERALL_TARGET)
 PHP_SUBST(PHP_RPATHS)
 PHP_SUBST(PHP_SAPI)
 PHP_SUBST_OLD(PHP_VERSION)
 PHP_SUBST_OLD(PHP_VERSION_ID)
 PHP_SUBST(SHELL)
-PHP_SUBST(SHARED_LIBTOOL)
 PHP_SUBST(PHP_FRAMEWORKS)
 PHP_SUBST(PHP_FRAMEWORKPATH)
 PHP_SUBST(INSTALL_HEADERS)
@@ -1676,7 +1671,6 @@ PHP_SET_LIBTOOL_VARIABLE([--tag CC])
 
 test -z "$PHP_COMPILE" && PHP_COMPILE='$(LIBTOOL) --mode=compile $(COMPILE) -c $<'
 test -z "$CXX_PHP_COMPILE" && CXX_PHP_COMPILE='$(LIBTOOL) --mode=compile $(CXX_COMPILE) -c $<'
-SHARED_LIBTOOL='$(LIBTOOL)'
 
 CC=$old_CC
 

scripts/phpize.m4

@@ -204,9 +204,7 @@ PHP_SUBST(PHP_EXECUTABLE)
 PHP_SUBST(EXTRA_LDFLAGS)
 PHP_SUBST(EXTRA_LIBS)
 PHP_SUBST(INCLUDES)
-PHP_SUBST(LFLAGS)
 PHP_SUBST(LDFLAGS)
-PHP_SUBST(SHARED_LIBTOOL)
 PHP_SUBST(LIBTOOL)
 PHP_SUBST(SHELL)
 PHP_SUBST(INSTALL_HEADERS)