df is never built while cross-compiling for a linux target

[Mike Frysinger]

in coreutils-6.9, the df prog (DF_PROG) is only built when gl_cv_fs_space 
evaluates to "yes" ... this variable is set up in m4/fsusage.m4 in 
gl_FILE_SYSTEM_USAGE

unfortunately, pretty much all of the tests are AC_TRY_RUN tests (every single 
one that matters for Linux is for sure) ... so when cross-compiling coreutils 
for a linux target, the df utility will never be built as all of these tests 
will set gl_cv_fs_space to no

is there any final fall back compile-only test we can come up with here ?
-mike

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