testing/nlohmann-json: disable test-unicode_all on aarch64

testing/nlohmann-json/APKBUILD

@@ -22,7 +22,12 @@ build() {
 }
 
 check() {
-	CTEST_OUTPUT_ON_FAILURE=TRUE ctest
+	local skipped_tests=
+	if [ "$CARCH" = "aarch64" ]; then
+		# test-unicode_all takes too long and times out
+		skipped_tests="$skipped_tests|test-unicode_all"
+	fi
+	CTEST_OUTPUT_ON_FAILURE=TRUE ctest -E "($skipped_tests)"
 }
 
 package() {