Improve the compiler check for -Wno-ambiguous-member-template support
Improve the compiler check for -Wno-ambiguous-member-template support

cgvarela/passenger,kewaunited/passenger,clemensg/passenger,clemensg/passenger,phusion/passenger,cgvarela/passenger,kewaunited/passenger,antek-drzewiecki/passenger,kewaunited/passenger,cgvarela/passenger,phusion/passenger,phusion/passenger,clemensg/passenger,phusion/passenger,phusion/passenger,antek-drzewiecki/passenger,kewaunited/passenger,kewaunited/passenger,antek-drzewiecki/passenger,cgvarela/passenger,phusion/passenger,clemensg/passenger,clemensg/passenger,antek-drzewiecki/passenger,kewaunited/passenger,cgvarela/passenger,clemensg/passenger,kewaunited/passenger,cgvarela/passenger,phusion/passenger,antek-drzewiecki/passenger,clemensg/passenger,cgvarela/passenger,antek-drzewiecki/passenger,clemensg/passenger,antek-drzewiecki/passenger,phusion/passenger,cgvarela/passenger,antek-drzewiecki/passenger,kewaunited/passenger