toolchain: Add zlib

ccache needs this and usually comes with an own bundled
version but fails to build in version 3.4.1.

Since this is a small library only and we really want
ccache to use compression, we will build this indepently
and let ccache use it from the system.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

lfs/zlib

@@ -71,15 +71,17 @@ $(subst %,%_MD5,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	@$(PREBUILD)
 	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE)
-	cd $(DIR_APP) && ./configure --prefix=/usr --shared
+	cd $(DIR_APP) && ./configure --prefix=$(PREFIX) --shared
 	cd $(DIR_APP) && make $(MAKETUNING)
 	cd $(DIR_APP) && make install
 
+ifneq "$(TOOLCHAIN)" "1"
 	mv -v /usr/lib/libz.so.$(VER) /lib/libz.so.$(VER)
 	ln -svf libz.so.$(VER) /lib/libz.so.1
 	ln -svf libz.so.$(VER) /lib/libz.so
 	rm -vf /usr/lib/libz.so.1
 	rm -vf /usr/lib/libz.so
+endif
 
 	@rm -rf $(DIR_APP)
 	@$(POSTBUILD)

make.sh

@@ -928,6 +928,7 @@ buildtoolchain() {
 	lfsmake1 gcc			PASS=L
 	lfsmake1 binutils			PASS=2
 	lfsmake1 gcc			PASS=2
+	lfsmake1 zlib
 	lfsmake1 ccache			PASS=2
 	lfsmake1 tcl
 	lfsmake1 expect