PIE executables created with mingw use "mainCRTStartup" as their entry point.
PIE executables created with mingw use "mainCRTStartup" as their entry point.

Bug: 14416410

Our linker uses "start" as the primary entry point, so we need to adjust this
for mingw-based Windows compiles, or nothing will execute correctly.

Change-Id: I6e99f43e075ef9f00500099ce34ec4425c996454

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build