Installation issue: GNU M4 with aocc

[saikovuri]

Steps to reproduce the issue

$ spack install m4%aocc
...

Information on your system

• Spack: 0.14.0-3186-ec0c299
• Python: 2.7.5
• Platform: linux-rhel7-zen2

Additional information

spack-build-env.txt
spack-build-out.txt

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have run spack maintainers <name-of-the-package> and @mentioned any maintainers
• I have uploaded the build log and environment files
• I have searched the issues of this repo and believe this is not a duplicate

[akashyap-amd]

Issue in m4 package missing support for aocc.
Addressed in commit b2bf61c

Testing fix