travis: fix packaging mingw build

scripts/build_mingw_engine.sh

@@ -9,11 +9,12 @@ export CXX="ccache i686-w64-mingw32-g++"
 export CFLAGS="-static-libgcc -no-pthread"
 export CXXFLAGS="-static-libgcc -static-libstdc++"
 export WINRC="i686-w64-mingw32-windres"
+rm -rf build # clean build directory
 ./waf configure --sdl2=$TRAVIS_BUILD_DIR/SDL2_mingw/i686-w64-mingw32/ --disable-vgui --build-type=debug --verbose || die # can't compile VGUI support on MinGW, due to differnet C++ ABI
 ./waf build -j2 --verbose || die
 cp $TRAVIS_BUILD_DIR/SDL2_mingw/i686-w64-mingw32//bin/SDL2.dll . # Install SDL2
 cp vgui_support_bin/vgui_support.dll .
-cp build-mingw/engine/xash.dll .
-cp build-mingw/mainui/menu.dll .
-cp build-mingw/game_launch/xash3d.exe .
+cp build/engine/xash.dll .
+cp build/mainui/menu.dll .
+cp build/game_launch/xash3d.exe .
 7z a -t7z $TRAVIS_BUILD_DIR/xash3d-mingw.7z -m0=lzma2 -mx=9 -mfb=64 -md=32m -ms=on *.dll *.exe