bash: Ensure deterministic build

Bash keeps a count of the number of times make was invoked on a directory
and changes the output versioning accordingly. We want deterministic output
so disable this behaviour.

(From OE-Core rev: 13a039e03195a47c750d5901e96fe81cf523481f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/bash/bash.inc

@@ -62,6 +62,11 @@ do_compile_ptest () {
 	oe_runmake buildtest
 }
 
+do_install:prepend () {
+	# Ensure determinism as this counter increases for each make call
+	rm -f ${B}/.build
+}
+
 do_install:append () {
 	# Move /usr/bin/bash to /bin/bash, if need
 	if [ "${base_bindir}" != "${bindir}" ]; then