build: checkout submodules in the right version

When run make git-update, this will checkout the submodule
for the especified version.

build/m4/brotli.mk

@@ -1,6 +1,8 @@
 #
 # Brotli
 #
+BROTLI_GIT_VERSION:=v1.0.9
+
 build/lib/brotli/js/decode.js: build/lib/brotli/configured
 build/lib/brotli/js/polyfill.js: build/lib/brotli/configured
 build/lib/brotli/configured: lib/brotli $(wildcard $(BASE_DIR)build/patches/brotli/*.patch)
@@ -37,4 +39,7 @@ git-brotli:
 	cd lib/brotli && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(BROTLI_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive

build/m4/expat.mk

@@ -1,6 +1,8 @@
 #
 # Expat
 #
+EXPAT_GIT_VERSION:=R_2_4_1
+
 build/lib/expat/configured: lib/expat
 	mkdir -p build/lib/expat
 	touch build/lib/expat/configured
@@ -31,4 +33,7 @@ git-expat:
 	cd lib/expat && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(EXPAT_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive

build/m4/fontconfig.mk

@@ -1,6 +1,8 @@
 #
 # Fontconfig
 #
+FONTCONFIG_GIT_VERSION:=2.13.94
+
 build/lib/fontconfig/configure: lib/fontconfig $(wildcard $(BASE_DIR)build/patches/fontconfig/*.patch)
 	rm -rf build/lib/fontconfig
 	cp -r lib/fontconfig build/lib/fontconfig
@@ -34,4 +36,7 @@ git-fontconfig:
 	cd lib/fontconfig && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(FONTCONFIG_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive

build/m4/freetype.mk

@@ -1,6 +1,7 @@
 #
 # Freetype
 #
+FREETYPE_GIT_VERSION:=VER-2-11-0
 
 ## Without Harfbuzz (Bootstrap)
 build/lib/freetype/build_hb/dist_hb/lib/libfreetype.a: $(DIST_DIR)/lib/libbrotlidec.a $(wildcard $(BASE_DIR)build/patches/freetype/*.patch)
@@ -66,4 +67,7 @@ git-freetype:
 	cd lib/freetype && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(FREETYPE_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive

build/m4/fribidi.mk

@@ -1,6 +1,8 @@
 #
 # Fribidi
 #
+FRIBIDI_GIT_VERSION:=v1.0.10
+
 build/lib/fribidi/configure: lib/fribidi $(wildcard $(BASE_DIR)build/patches/fribidi/*.patch)
 	rm -rf build/lib/fribidi
 	mkdir -p build/lib
@@ -34,4 +36,7 @@ git-fribidi:
 	cd lib/fribidi && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(FRIBIDI_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive

build/m4/harfbuzz.mk

@@ -1,6 +1,8 @@
 #
 # Harfbuzz
 #
+HARFBUZZ_GIT_VERSION:=2.8.2
+
 build/lib/harfbuzz/configure: lib/harfbuzz $(wildcard $(BASE_DIR)build/patches/harfbuzz/*.patch)
 	rm -rf build/lib/harfbuzz
 	cp -r lib/harfbuzz build/lib/harfbuzz
@@ -48,4 +50,7 @@ git-harfbuzz:
 	cd lib/harfbuzz && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(HARFBUZZ_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive

build/m4/libass.mk

@@ -1,6 +1,8 @@
 #
 # libass
 #
+LIBASS_GIT_VERSION:=643829edd8408ec37182a04040fe5a7bf54dccc3
+
 build/lib/libass/configured: lib/libass
 	rm -rf build/lib/libass
 	cd lib/libass && NOCONFIGURE=1 ./autogen.sh
@@ -34,4 +36,7 @@ git-libass:
 	cd lib/libass && \
 	git reset --hard && \
 	git clean -dfx && \
-	git pull origin master
+	git fetch origin && \
+	git checkout $(LIBASS_GIT_VERSION) && \
+	git submodule sync --recursive && \
+	git submodule update --init --recursive