[binutils-gdb] Correct shell compatibility issue detected with pkgsrc.

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT a102602bc56e418f9794d653ef103a65f08a5a49 ***

Author: Kamil Rytarowski <n54@gmx.com>
Branch: master
Commit: a102602bc56e418f9794d653ef103a65f08a5a49

Correct shell compatibility issue detected with pkgsrc.

String comparison of in a POSIX bourne shell must be done
with '=', not '=='. For example the NetBSD sh(1) does not
support it.

gdb/ChangeLog
2017-09-06  Kamil Rytarowski  <n54@gmx.com>

	* config/djgpp/djconfig.sh: Correct shell portability issue.