Fix Build for Gentoo
Fix Build for Gentoo

Modify SConscript so that it recognizes the standard name for the
mozjs/spidermonkey lib on gentoo.

andrejb/cloudant_bigcouch,PerilousApricot/bigcouch,breezjw/bigcouch,PerilousApricot/bigcouch,PerilousApricot/bigcouch,kofron/bigcouch,PerilousApricot/bigcouch,linearregression/bigcouch,breezjw/bigcouch,cloudant/bigcouch,kofron/bigcouch,andrejb/cloudant_bigcouch,andrejb/cloudant_bigcouch,kofron/bigcouch,kofron/bigcouch,PerilousApricot/bigcouch,andrejb/cloudant_bigcouch,andrejb/cloudant_bigcouch,linearregression/bigcouch,linearregression/bigcouch,linearregression/bigcouch,cloudant/bigcouch,kofron/bigcouch,breezjw/bigcouch,andrejb/cloudant_bigcouch,cloudant/bigcouch,kofron/bigcouch,breezjw/bigcouch,PerilousApricot/bigcouch,cloudant/bigcouch,linearregression/bigcouch,cloudant/bigcouch,breezjw/bigcouch,linearregression/bigcouch,linearregression/bigcouch,cloudant/bigcouch,cloudant/bigcouch,andrejb/cloudant_bigcouch,breezjw/bigcouch