remove unneeded compile assertion test, doesn't work on MySQL
remove unneeded compile assertion test, doesn't work on MySQL

alex/sqlalchemy,brianv0/sqlalchemy,itkovian/sqlalchemy,epa/sqlalchemy,pdufour/sqlalchemy,Cito/sqlalchemy,elelianghh/sqlalchemy,bootandy/sqlalchemy,bdupharm/sqlalchemy,wujuguang/sqlalchemy,EvaSDK/sqlalchemy,epa/sqlalchemy,elelianghh/sqlalchemy,halfcrazy/sqlalchemy,pdufour/sqlalchemy,robin900/sqlalchemy,inspirehep/sqlalchemy,inspirehep/sqlalchemy,bdupharm/sqlalchemy,davidfraser/sqlalchemy,olemis/sqlalchemy,davidjb/sqlalchemy,276361270/sqlalchemy,EvaSDK/sqlalchemy,sandan/sqlalchemy,wfxiang08/sqlalchemy,monetate/sqlalchemy,robin900/sqlalchemy,ThiefMaster/sqlalchemy,Cito/sqlalchemy,brianv0/sqlalchemy,hsum/sqlalchemy,alex/sqlalchemy,itkovian/sqlalchemy,sandan/sqlalchemy,hsum/sqlalchemy,halfcrazy/sqlalchemy,bootandy/sqlalchemy,dstufft/sqlalchemy,olemis/sqlalchemy,Akrog/sqlalchemy,wfxiang08/sqlalchemy,monetate/sqlalchemy,graingert/sqlalchemy,Akrog/sqlalchemy,ThiefMaster/sqlalchemy,davidfraser/sqlalchemy,zzzeek/sqlalchemy,j5int/sqlalchemy,WinterNis/sqlalchemy,Cito/sqlalchemy,j5int/sqlalchemy,sqlalchemy/sqlalchemy,WinterNis/sqlalchemy,276361270/sqlalchemy,graingert/sqlalchemy,davidjb/sqlalchemy,wujuguang/sqlalchemy,dstufft/sqlalchemy,alex/sqlalchemy