Make component_build_aes_aesce_armcc silent

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

tests/scripts/all.sh

@@ -4340,6 +4340,7 @@ component_build_aes_aesce_armcc () {
 }
 
 support_build_sha_armce() {
+    if ( $(which clang > /dev/null) ); then
         # clang >= 4 is required to build with SHA extensions
         clang_ver="$(clang --version|grep version|sed -E 's#.*version ([0-9]+).*#\1#')"
 
@@ -4347,6 +4348,10 @@ support_build_sha_armce() {
         echo '#include <asm/hwcap.h>' | clang -E - >/dev/null 2>&1 && have_hwcap=1 || have_hwcap=0
 
         [[ "${clang_ver}" -ge 4 && "${have_hwcap}" -eq 1 ]]
+    else
+        # clang not available
+        false
+    fi
 }
 
 component_build_sha_armce () {