gitignore: ignore MinGW and Cygwin binary outputs

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Created by  Steven Noonan  on October 10, 2009
KUNDGJ43WO5ONDKLIAXC6M34ZQZGFS4XGFMNF6QKNV2XVMCRJO3AC
Change contents