The regressions here are primarily from duplicated '-B' additions.
We remove the duplicate on the link line.
We also make sure that platforms with extensions other than .so for
shared libs will have the correct paths.
PR target/112864
libphobos/ChangeLog:
* testsuite/lib/libphobos.exp: Use ${shlib_ext} instead of
hard-wiring '.so'.
* testsuite/testsuite_flags.in: Remove duplicate -B option
for spec file path.
f4aa644dbb