wine: install in parallel

On a 48-thread CPU, this reduced the time of `nix-build -A
wineWowPackages.stable` from ~15 min. to ~10 min.

+2 -2
+2 -2
pkgs/applications/emulators/wine/builder-wow.sh
··· 45 45 # checkPhase 46 46 47 47 eval "$preInstall" 48 - cd $TMP/wine-wow && make install 49 - cd $TMP/wine64 && make install 48 + cd $TMP/wine-wow && make install -j$NIX_BUILD_CORES 49 + cd $TMP/wine64 && make install -j$NIX_BUILD_CORES 50 50 eval "$postInstall" 51 51 fixupPhase