component/zstd: always build with zlib, xz-utils and lz4

Otherwise it will try to use development system package and we will have
different results depending on wether that package is installed or not.

Note that because of a typo in the environment variable (this makefile
uses $LDFLAGS, slapos zlib was not effective so far)

component/zstd/buildout.cfg

 [buildout]
-extends = ../zlib/buildout.cfg
+extends =
+  ../zlib/buildout.cfg
+  ../xz-utils/buildout.cfg
+  ../lz4/buildout.cfg
 parts =
   zstd
 
 [zstd]
 recipe = slapos.recipe.cmmi
+shared = true
 url = https://github.com/facebook/zstd/releases/download/v${:version}/zstd-${:version}.tar.gz
 version = 1.4.4
 md5sum = 487f7ee1562dee7c1c8adf85e2a63df9
-shared = true
 location = @@LOCATION@@
 configure-command = :
 environment =
   PREFIX=${:location}
-  LD_FLAGS=-L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib
-  CFLAGS=-I${zlib:location}/include
+  LDFLAGS=-L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${xz-utils:location}/lib -Wl,-rpath=${xz-utils:location}/lib -L${lz4:location}/lib -Wl,-rpath=${lz4:location}/lib
+  CFLAGS=-I${zlib:location}/include -I${xz-utils:location}/include -I${lz4:location}/include