os-release: Fix taskhash mismatch under sstate

When running with the sstate enabled, we get an error like:

    ERROR: os-release-1.0-r0 do_compile: Taskhash mismatch
    f701250f9d5eb01c0164fed0746f9720 verses 8ce6327369d840e58ac59a411d713495
    for .../os-release.bb.do_compile

Remove a few variables from the vardeps to resolve this.

Change-Id: I287535744dd1e671fe411e27474661fbb467bb78
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

meta-phosphor/common/recipes-core/os-release/os-release.bbappend

@@ -20,4 +20,4 @@ python() {
 
 OS_RELEASE_FIELDS_append = " BUILD_ID"
 do_compile[nostamp] = "1"
-do_compile_remove[vardeps] = "BUILD_ID"
+do_compile_remove[vardeps] = "BUILD_ID VERSION VERSION_ID"