Commit 5230d62fe added a #define NOMINMAX, which conflicts with a
NOMINMAX definition in the MinGW headers. Just use the same definition
as in MinGW to fix the gcc warning.
Change-Id: Ib21dd323ebbdca5d143e394c7631303e0c72541a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>