ci: also use clang for compel-host-bin

Running in an environment with clang and without gcc even installed
does not work as compel-host-bin uses HOSTCC which defaults to gcc.

If CLANG=1 is set this also sets HOSTCC to clang to actually build
compel-host-bin with clang and not with gcc.

Signed-off-by: Adrian Reber <areber@redhat.com>

scripts/ci/run-ci-tests.sh

@@ -55,6 +55,10 @@ ci_prep () {
 	if [ "$CLANG" = "1" ]; then
 		# clang support
 		CC=clang
+		# If this is running in an environment without gcc installed
+		# compel-host-bin will fail as it is using HOSTCC. Also
+		# set HOSTCC to clang to build compel-host-bin with it.
+		export HOSTCC=clang
 	else
 		CC=gcc
 	fi