Ensure test_psa_compliance uses gcc

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index fe3f594..d0c59ff 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -6030,8 +6030,9 @@
 }
 
 component_test_psa_compliance () {
+    # The arch tests build with gcc, so require use of gcc here to link properly
     msg "build: make, default config (out-of-box), libmbedcrypto.a only"
-    make -C library libmbedcrypto.a
+    CC=gcc make -C library libmbedcrypto.a
 
     msg "unit test: test_psa_compliance.py"
     ./tests/scripts/test_psa_compliance.py