Issue while building : KeyError: 'LOGNAME'

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Hello,

I am trying to build mpiP and see below error:

```
==> 'make'
python /home/guest/workarena/softwares/sources/spack/var/spack/stage/mpip-3.4.1-x7l5jk256ayuuirddcxdpbpytlnis3hq/mpiP-3.4.1/make-wrappers.py --xlate --arch=x86_64 --f77symbol symbol_ mpi.protos.txt make-wrappers.py
MPI Wrapper Generator ($Revision: 498 $)
-----*----- Parsing input file
-----*----- Parsing completed: 162 functions found.
-----*----- Beginning parameter optimization
-----*----- Generating structure files
Traceback (most recent call last):
File "/home/guest/workarena/softwares/sources/spack/var/spack/stage/mpip-3.4.1-x7l5jk256ayuuirddcxdpbpytlnis3hq/mpiP-3.4.1/make-wrappers.py", line 1425, in
main()
File "/home/guest/workarena/softwares/sources/spack/var/spack/stage/mpip-3.4.1-x7l5jk256ayuuirddcxdpbpytlnis3hq/mpiP-3.4.1/make-wrappers.py", line 1414, in main
GenerateStructureFile()
File "/home/guest/workarena/softwares/sources/spack/var/spack/stage/mpip-3.4.1-x7l5jk256ayuuirddcxdpbpytlnis3hq/mpiP-3.4.1/make-wrappers.py", line 745, in GenerateStructureFile
olist = StandardFileHeader(sname)
File "/home/guest/workarena/softwares/sources/spack/var/spack/stage/mpip-3.4.1-x7l5jk256ayuuirddcxdpbpytlnis3hq/mpiP-3.4.1/make-wrappers.py", line 712, in StandardFileHeader
olist.append("/* Creator: " + os.environ["LOGNAME"] + " */\n")
File "/usr/lib/python2.7/UserDict.py", line 40, in __getitem__
raise KeyError(key)
KeyError: 'LOGNAME'
Makefile:235: recipe for target 'mpiPi_def.h' failed
make: *** [mpiPi_def.h] Error 1
==> Error: ProcessError: Command exited with status 2:
'make'
```

The LOGNAME env variable is not set on this system (actually container). Would be nice if we handle this case.

Start in make-wrappers.py at StandardFileHeader, where the traceback shows os.environ["LOGNAME"] is accessed, and review the make-wrappers.py invocation from the Makefile. Reproduce the build with LOGNAME unset; done means mpiPi_def.h is generated and make completes without the KeyError.

Written by the indexing model from the issue text.