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XL: Fix the use of -qhalt flag

Chuck Atkins requested to merge chuck.atkins/cmake:fix-qhalt-for-xl into master

The valid options to pass to the IBM XL compiler for the -qhalt option vary widely by language and platform. Based on existing documentation, the following table shows which error levels are valid to pass to the qhalt options:

OS       |  xlc  |  xlC  |   xlf   |
---------|-------|------------------
AIX      | iwes  | iw s  | ilwesu  |
BlueGene | iwes  | iwes  | ilwesu  |
OS X     | iwesu | iwesu | ilwesu  |
Linux    |  w    |  w    | ilwesu  |

You can see the warnings reductions here by using this patch to drive a CMake Experimental build:

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