net-print/cups: backport test fix to 2.4.7-r2

We can't mkdir twice as it breaks multilib, even though we don't actually run the
tests for non-native abi.

Signed-off-by: Sam James <sam@gentoo.org>

net-print/cups/cups-2.4.7-r2.ebuild

@@ -213,13 +213,13 @@ multilib_src_compile() {
 }
 
 multilib_src_test() {
-	# Avoid using /tmp
-	export CUPS_TESTBASE="${T}"/cups-tests
-
-	mkdir "${T}"/cups-tests || die
-
 	# We only build some of CUPS for multilib, so can't run the tests.
 	if multilib_is_native_abi; then
+		# Avoid using /tmp
+		export CUPS_TESTBASE="${T}"/cups-tests
+
+		mkdir "${T}"/cups-tests || die
+
 		# avoid building *and running* test binaries in src_compile
 		# https://github.com/OpenPrinting/cups/commit/b1d42061e9286f50eefc851ed906d17c6e80c4b0
 		emake UNITTESTS=unittests