Add msys build script(Git for Windows + llvm-mingw)

scripts/bootstrap-cmake-msys.sh

@@ -0,0 +1,14 @@
+curdir=`pwd`
+
+builddir=${curdir}/build-msys
+
+rm -rf ${builddir}
+mkdir ${builddir}
+
+# Assume mingw-32-make, clang, etc is installed
+# Easyest way is to unpack llvm-mingw32 and add path to it.
+
+cd ${builddir} && CXX=clang++.exe CC=clang.exe cmake \
+  -G "MinGW Makefiles" \
+  -DCMAKE_VERBOSE_MAKEFILE=1 \
+  ..

src/tinyusdz.cc

@@ -41,9 +41,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifdef _WIN32
 
+#ifdef _MSC_VER
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
+#endif
 
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
@@ -51,7 +53,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <windows.h>  // include API for expanding a file path
 
+#ifdef _MSC_VER
 #undef NOMINMAX
+#endif
+
 #undef WIN32_LEAN_AND_MEAN
 
 #if defined(__GLIBCXX__)  // mingw