with the introduction of brandz the linker on x86 was made aware of the new
brand aux vectors, and if the linker detects that it's executing in a branded
environment then it ignores the LD_* environment variables that would normally
affect it's operation. instead it checks for LD_BRAND_* variables. unfortunatly
support for this was only implemented on x86. this functionaltiy should also
be supported on sparc.