msvc: update Makefile to allow for spaces in the compiler path
It is quite common that MS Visual C++ is installed into a location whose
path contains spaces, therefore we need to quote it.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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