travis: Run the "all" test case with leak detective enabled

But disable the gcrypt plugin, as it causes leaks.

Also disable the backtraces by libunwind as they seem to cause
threads to get cleaned up after the leak detective already has been
disabled, which leads to invalid free()s.

scripts/test.sh

@@ -32,6 +32,12 @@ all)
 			--disable-dumm --disable-kernel-pfroute --disable-keychain
 			--disable-lock-profiler --disable-maemo --disable-padlock
 			--disable-osx-attr --disable-tkm --disable-uci"
+	if test "$LEAK_DETECTIVE" = "yes"; then
+		# libgcrypt can't be deinitialized
+		CONFIG="$CONFIG --disable-gcrypt"
+		# libunwind causes threads to be cleaned up after LD is disabled
+		CONFIG="$CONFIG --disable-unwind-backtraces"
+	fi
 	# not enabled on the build server
 	CONFIG="$CONFIG --disable-af-alg"
 	# TODO: enable? perhaps via coveralls.io (cpp-coveralls)?