build: no 'make clean' anymore at the end of mingw builds.

This command was removing translations files at the end of
the build which are required by the client.

Change-Id: I8e665315570c9e5c3dd468ef2418aa551809f739

scripts/win_compile.sh

@@ -76,4 +76,3 @@ cd build
 ${HOST}-qmake-qt5 ../RingWinClient.pro -r -spec win32-g++ RING=$INSTALL_PREFIX
 make -j4 || exit 1
 make install
-make clean