set ISA depend path in GAR recipe

[Carsten Grzemba]

I set

CONFIGURE_ARGS += --with-httpd=/opt/csw/sbin/$(ISA_DEFAULT)/httpd

to get /opt/csw/sbin/amd64/httpd on x86 64bit build but it expand to: 

configure: error: /opt/csw/sbin/pentium_pro/httpd not found

on 
 ==> Running configure in work/build-isa-amd64/admin-389-admin-1.1.38

What's going wrong there? 
Is there a GAR variable which will set to "" on 32bit and amd64 or sparcv9 on 64bit build?
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