Quote file names in tests that can be absolute.

Quote file names in tests that can be absolute.

* tests/auxdir.test, tests/check3.test, tests/check4.test,
tests/compile.test, tests/cond33.test, tests/condhook.test,
tests/distdir.test, tests/dollar.test, tests/empty.test,
tests/gnits2.test, tests/gnits3.test, tests/include2.test,
tests/insthook.test, tests/java.test, tests/libtool7.test,
tests/lisp4.test, tests/lisp5.test, tests/lisp6.test,
tests/ltcond.test, tests/ltconv.test, tests/mkinst2.test,
tests/multlib.test, tests/nobase.test, tests/nodist2.test,
tests/obsolete.test, tests/pr287.test, tests/pr300-lib.test,
tests/pr300-ltlib.test, tests/pr300-prog.test, tests/python10.test,
tests/python3.test, tests/strip.test, tests/transform.test,
tests/txinfo13.test, tests/txinfo19.test, tests/txinfo22.test,
tests/txinfo23.test, tests/txinfo26.test, tests/txinfo27.test:
Likewise.