fix a couple of travis build failures

scripts/travis

@@ -27,7 +27,7 @@ if [ "x$ARCH" = "xnative" ]; then
 	else
 		sudo apt-add-repository -y ppa:kalakris/cmake
 		sudo apt-get update
-		sudo apt-get install -y $ARCH-x-gcc cmake ninja-build
+		sudo apt-get install -y cmake ninja-build
 		cmake .. -GNinja
 		ninja
 	fi
@@ -38,7 +38,7 @@ else
 	fi
 	export CC=$CPU-w64-mingw32-gcc
 
-	if ! hash $CC 2>/dev/null; then
+	if hash $CC 2>/dev/null; then
 		# Update Ubuntu 12.04 with current mingw toolchain
 		sudo apt-add-repository -y ppa:tobydox/mingw-x-precise
 		sudo apt-get update