msvc: build with multiple processes

Author: jef-n

ms-windows/osgeo4w/package-nightly.cmd

@@ -130,7 +130,7 @@ cmake -G "Visual Studio 9 2008" ^
 	-D QWT_INCLUDE_DIR=%O4W_ROOT%/include/qwt ^
 	-D QWT_LIBRARY=%O4W_ROOT%/lib/qwt5.lib ^
 	-D CMAKE_INSTALL_PREFIX=%O4W_ROOT%/apps/%PACKAGENAME% ^
-	-D CMAKE_CXX_FLAGS_RELWITHDEBINFO="/MD /ZI /Od /D NDEBUG /D QGISDEBUG" ^
+	-D CMAKE_CXX_FLAGS_RELWITHDEBINFO="/MD /ZI /MP /Od /D NDEBUG /D QGISDEBUG" ^
 	-D FCGI_INCLUDE_DIR=%O4W_ROOT%/include ^
 	-D FCGI_LIBRARY=%O4W_ROOT%/lib/libfcgi.lib ^
 	%SRCDIR%>>%LOG% 2>&1

ms-windows/osgeo4w/package-nightly64.cmd

@@ -126,7 +126,7 @@ cmake -G "Visual Studio 10 Win64" ^
 	-D QWT_INCLUDE_DIR=%O4W_ROOT%/include/qwt ^
 	-D QWT_LIBRARY=%O4W_ROOT%/lib/qwt5.lib ^
 	-D CMAKE_INSTALL_PREFIX=%O4W_ROOT%/apps/%PACKAGENAME% ^
-	-D CMAKE_CXX_FLAGS_RELWITHDEBINFO="/MD /Zi /Od /D NDEBUG /D QGISDEBUG" ^
+	-D CMAKE_CXX_FLAGS_RELWITHDEBINFO="/MD /Zi /MP /Od /D NDEBUG /D QGISDEBUG" ^
 	-D FCGI_INCLUDE_DIR=%O4W_ROOT%/include ^
 	-D FCGI_LIBRARY=%O4W_ROOT%/lib/libfcgi.lib ^
 	-D SETUPAPI_LIBRARY="%PROGRAMFILES(X86)%/Microsoft SDKs/Windows/v7.0A/Lib/x64/SetupAPI.Lib" ^