Resolve PIE and missing build-id error messages
    
    Long standing rpmlint (fedpkg lint) error messages concerning the lack
    of PIE and missing build-ids are resolved. Syntax from %gobuildid macro
    combined with information from upstream makefile and golang code base
    resulted in the use of GOFLAGS export for the compiler and GOLDFLAGS
    export for the external linker. Binaries in these rpms are in much
    better conformance with fedora standards.