Drop LDFLAGS where unnecessary
    
    Since https://fedoraproject.org/wiki/Changes/SetBuildFlagsBuildCheck landed,
    LDFLAGS is now exported, but the build macros were passing gcc/ld specific flags
    to Go's link tool which were not understood by it.
    
    Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>