debian/patches: Patch .gitignore first so git doesn't ignore addiitons

We need to remove /debian/ from the upstream .gitignore, without which
inserting any further patches requires -f.

debian/patches/series

@@ -1,3 +1,5 @@
+debian/gitignore.patch
+
 # Disable features broken by exclusion of upstream files
 debian/dfsg/arch-powerpc-platforms-8xx-ucode-disable.patch
 debian/dfsg/drivers-media-dvb-dvb-usb-af9005-disable.patch
@@ -9,7 +11,6 @@ debian/dfsg/video-remove-nvidiafb-and-rivafb.patch
 debian/version.patch
 debian/uname-version-timestamp.patch
 debian/kernelvariables.patch
-debian/gitignore.patch
 debian/ia64-hardcode-arch-script-output.patch
 debian/mips-disable-werror.patch
 debian/mips-boston-disable-its.patch