vips: Add Debian's reproducible build patch

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/vips/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=vips
 PKG_VERSION:=8.7.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/libvips/libvips/releases/download/v$(PKG_VERSION)

libs/vips/patches/010-reproducible-build.patch

@@ -0,0 +1,20 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby@debian.org>
+Reviewed-By: Laszlo Boszormenyi (GCS) <gcs@debian.org>
+Last-Update: 2018-07-24
+
+--- vips-8.6.4.orig/configure.ac
++++ vips-8.6.4/configure.ac
+@@ -26,7 +26,11 @@ VIPS_MAJOR_VERSION=vips_major_version()
+ VIPS_MINOR_VERSION=vips_minor_version()
+ VIPS_MICRO_VERSION=vips_micro_version()
+ VIPS_VERSION=vips_version()
+-VIPS_VERSION_STRING=$VIPS_VERSION-`date -u -r ChangeLog`
++if test "x$SOURCE_DATE_EPOCH" = "x"; then
++  VIPS_VERSION_STRING=$VIPS_VERSION-`date -u -r ChangeLog`
++else
++  VIPS_VERSION_STRING=$VIPS_VERSION-`LC_ALL=C date --utc --date="@$SOURCE_DATE_EPOCH"`
++fi
+ 
+ # libtool library versioning ... not user-visible (except as part of the
+ # library file name) and does not correspond to major/minor/micro above