MSVC debug build fails if application has spaces in target name

Building application with spaces in its name fails, because the generated Makefile.debug contains CFLAG /Fd without double quotes in the pdb filepath e.g. CFLAGS = /Fddebug/My Application Name.pdb. This causes the debug build to fail with "unrecognized source file type Application" etc. errors.

The error is in qtbase/qmake/generators/win32/msvc_nmake.cpp init() function where the pdb filepath is added without double quotes.