Fix testsuite errors due to shell quoted parameter expansion issue.

Fix testsuite errors due to shell quoted parameter expansion issue.

* tests/getopt-m4sh.at (_LT_AT_GETOPT_M4SH_SETUP): Insert space
between double-quoted and unquoted shell parameter, as bash
4.0.28 doesn't add one in its output if the expansion of the
second one starts with a space.
(short option splitting, enhanced shell short option splitting)
(long option splitting, XSI long option splitting): Add space in
expected output.
Fixes testsuite failures on AIX, FreeBSD, etc.
Report by Rainer Tammer.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>