docs: Ignore php/extension/config.h.

Updates commit bd21993d77.

Makefile.am

@@ -308,7 +308,7 @@ ChangeLog: configure.ac
 docs/C_SOURCE_FILES: configure.ac
 	rm -f $@ $@-t
 	find $(DIST_SUBDIRS) -name '*.[ch]' | \
-	grep -v -E '^(builder/index-parse\.|builder/index-scan\.|examples/|gnulib/|gobject/|java/com_redhat_et_libguestfs|perl/|tests/|test-data/)' | \
+	grep -v -E '^(builder/index-parse\.|builder/index-scan\.|examples/|gnulib/|gobject/|java/com_redhat_et_libguestfs|perl/|php/extension/config\.h|tests/|test-data/)' | \
 	grep -v -E '/(guestfs|rc)_protocol\.' | \
 	grep -v -E '.*/errnostring\.' | \
 	grep -v -E '.*-gperf\.' | \

docs/C_SOURCE_FILES

@@ -271,7 +271,6 @@ p2v/p2v.h
 p2v/ssh.c
 p2v/utils.c
 p2v/whole-file.c
-php/extension/config.h
 php/extension/guestfs_php.c
 php/extension/php_guestfs_php.h
 python/actions-0.c