Remove some obsolete config_vars.mk occurrences

The `config_vars.mk` file was a part of previous *nix build system and
has been removed via 9d9d39a0de.

.gitignore

@@ -46,7 +46,6 @@ config.h.in
 config.log
 config.nice
 config.status
-config_vars.mk
 configure
 conftest
 conftest.c

scripts/dev/phpextdist

@@ -13,7 +13,7 @@ if test ! -f Makefile.in || test ! -f config.m4; then
 fi
 
 rm -rf modules *.lo *.o *.la config.status config.cache \
-config.log libtool php_config.h config_vars.mk Makefile
+config.log libtool php_config.h Makefile
 
 myname=`basename \`pwd\``
 cd ..