php7: restructure patches

- Add some more patches from Debian
- Rename existing ones (our own patches starts with prefix 1000+)

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

lang/php7/patches/0016-dont-gitclean-in-build.patch

@@ -0,0 +1,19 @@
+From: Debian PHP Maintainers <pkg-php-maint@lists.alioth.debian.org>
+Date: Sat, 2 May 2015 10:26:53 +0200
+Subject: dont-gitclean-in-build
+
+---
+ build/build.mk | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/build/build.mk b/build/build.mk
+index 9452984..b964def 100644
+--- a/build/build.mk
++++ b/build/build.mk
+@@ -63,6 +63,5 @@ gitclean-work:
+ 	@if (test ! -f '.git/info/exclude' || grep -s "git-ls-files" .git/info/exclude); then \
+ 		(echo "Rebuild .git/info/exclude" && echo '*.o' > .git/info/exclude && git svn propget svn:ignore | grep -v config.nice >> .git/info/exclude); \
+ 	fi; \
+-	git clean -X -f -d;
+ 
+ .PHONY: $(ALWAYS) snapshot