Create cmake-gen.bat

Author: tlk00

msvc32/cmake-gen.bat

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+REM Helper file to generate MSVC build environment with cmake
+
+REM Assign optimization options BMSSE42OPT or BMAVX2OPT
+cmake -DBMOPTFLAGS:STRING=none ..
+REM cmake -DBMOPTFLAGS:STRING=BMSSE42OPT ..
+REM cmake -DBMOPTFLAGS:STRING=BMAVX2OPT ..
+
+REM Generate Visual Studio project files
+cmake .. -G "Visual Studio 15 2017 Win32"