Coverity 1093367: logical vs bitwise operator in stars_draw_background()

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9920 387891d4-d844-0410-90c0-e4c51a9137d3
remove gcc warnings [-Wshadow] in ship/shiphit.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9921 387891d4-d844-0410-90c0-e4c51a9137d3
remove gcc warnings [-Wunused-but-set-variable] in ship/shiphit.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9922 387891d4-d844-0410-90c0-e4c51a9137d3