lld: Make a test not fail if "repro" is part of the build directory name

r268231 made it so that the name of the --reproduce archive
is no longer listed in the response file. Previously, with
"--reproduce repro.tar" the response file would contain

  repro/home/.../llvm-build-dir/.../foo.o

but after that change it contained

  home/.../llvm-build-dir/.../foo.o

instead. The test added for this in r268231 checked that
the response file doesn't contain the string "repro", but
if the build dir is named e.g. "llvm-build-repro" then the
test fails because of that.

Change the assert to check that "repro" doesn't exist at the
beginning of the line instead. I verified that the test
still fails with r268231 reverted.

The test technically still fails if someone builds llvm in a directory
'/repro' below the root directory. Don't do that :)

llvm-svn: 370211