There is no need to download source if we aren't on remote host.
Otherwise, each ld test run on local host leaves behind a couple
test files.
* config/default.exp (NOPIE_CFLAGS): Download source only on
remote host.
(NOPIE_LDFLAGS): Likewise.
* testsuite/lib/ld-lib.exp (check_lto_available): Likewise.
(check_lto_fat_available): Likewise.
(check_lto_shared_available): Likewise.
(check_ifunc_available): Likewise.
(check_ifunc_attribute_available): Likewise.
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