Contribs: add separate libpostproc.

(cherry picked from commit 18faa622)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/postproc/rules.mak

+# POSTPROC
+
+POSTPROC_SNAPURL := http://git.videolan.org/?p=libpostproc.git;a=snapshot;h=HEAD;sf=tgz
+
+POSTPROCCONF = \
+	--cc="$(CC)" \
+	--disable-debug \
+	--enable-gpl \
+	--enable-postproc
+
+DEPS_postproc = ffmpeg
+
+ifdef ENABLE_SMALL
+POSTPROCCONF += --enable-small --optflags=-O2
+endif
+
+ifdef HAVE_CROSS_COMPILE
+POSTPROCCONF += --enable-cross-compile --cross-prefix=$(HOST)-
+endif
+
+# ARM stuff
+ifeq ($(ARCH),arm)
+POSTPROCCONF += --disable-runtime-cpudetect --arch=arm
+ifdef HAVE_NEON
+POSTPROCCONF += --cpu=cortex-a8 --enable-neon
+POSTPROC_CFLAGS +=-mfloat-abi=softfp -mfpu=neon
+endif
+endif
+
+# Darwin
+ifdef HAVE_DARWIN_OS
+POSTPROCCONF += --arch=$(ARCH) --target-os=darwin
+endif
+ifeq ($(ARCH),x86_64)
+POSTPROCCONF += --cpu=core2
+endif
+
+# Linux
+ifdef HAVE_LINUX
+POSTPROCCONF += --target-os=linux
+# --enable-pic
+endif
+
+# Windows
+ifdef HAVE_WIN32
+POSTPROCCONF += --target-os=mingw32
+ifdef HAVE_WIN64
+POSTPROCCONF += --cpu=athlon64 --arch=x86_64
+else # !WIN64
+POSTPROCCONF+= --cpu=i686 --arch=x86
+endif
+else
+POSTPROCCONF += --enable-pthreads
+endif
+
+ifdef HAVE_WINCE
+POSTPROCCONF += --target-os=mingw32ce --arch=armv4l --cpu=armv4t
+endif
+
+POSTPROC_CFLAGS += --std=gnu99
+
+# Build
+
+PKGS += postproc
+ifeq ($(call need_pkg,"libpostproc"),)
+PKGS_FOUND += postproc
+endif
+
+$(TARBALLS)/postproc-git.tar.gz:
+	$(call download,$(POSTPROC_SNAPURL))
+
+POSTPROC_VERSION := git
+
+.sum-postproc: $(TARBALLS)/postproc-$(POSTPROC_VERSION).tar.gz
+	$(warning Not implemented.)
+	touch $@
+
+postproc: postproc-$(POSTPROC_VERSION).tar.gz .sum-postproc
+	rm -Rf $@ $@-git
+	mkdir -p $@-git
+	$(ZCAT) "$<" | (cd $@-git && tar xv --strip-components=1)
+ifdef HAVE_WIN32
+	sed -i "s/std=c99/std=gnu99/" $@-$(POSTPROC_VERSION)/configure
+endif
+	$(MOVE)
+
+.postproc: postproc
+	cd $< && $(HOSTVARS) ./configure \
+		--extra-cflags="$(POSTPROC_CFLAGS) -DHAVE_STDINT_H"  \
+		--extra-ldflags="$(LDFLAGS)" $(POSTPROCCONF) \
+		--prefix="$(PREFIX)" --enable-static --disable-shared
+	cd $< && $(MAKE) install-libs install-headers
+	touch $@