contrib/gumstix/build/profile:  add bitbake environment whitelist
contrib/gumstix/build/profile:  add bitbake environment whitelist

Required for bitbake 1.8.11 and later

yyli/overo-oe,scottellis/overo-oe,John-NY/overo-oe,nzjrs/overo-openembedded,yyli/overo-oe,yyli/overo-oe,nzjrs/overo-openembedded,yyli/overo-oe,nzjrs/overo-openembedded,yyli/overo-oe,John-NY/overo-oe,scottellis/overo-oe,John-NY/overo-oe,nzjrs/overo-openembedded,nzjrs/overo-openembedded,John-NY/overo-oe,scottellis/overo-oe,scottellis/overo-oe,yyli/overo-oe,scottellis/overo-oe,nzjrs/overo-openembedded,scottellis/overo-oe,scottellis/overo-oe,John-NY/overo-oe,John-NY/overo-oe,nzjrs/overo-openembedded,John-NY/overo-oe,yyli/overo-oe,yyli/overo-oe