execution_monitor.ipp not portable on slightly older FreeBSD machines

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boost/test/impl/execution_monitor.ipp

In the main switch statements, execution_monitor.ipp is now check for the optional specific signal codes which not all FreeBSD machines support (namely anything less than 7.0 does not set these codes in the kernel nor defines them in /usr/include/sys/signal.h).

The attached patch builds on 6,7 and CURRENT and should be innocuous to other platforms.

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Patch against current trunk to fix this issue on FreeBSD

[Vladimir Prus]

Gennadiy, did you look into this patch?

Note that a similar issue was reported in #1838, and fixed. However, Alexander (the submitter of this issue), reported that this specific issue is still there for him.

Alexander, can you double-check that the patch from #1838 is present in your source tree?

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It is not and I am synced with trunk. The other thing is that the patch has a bug in it as attached (I don't know how this happened) but as per #1838 I want to check against anything less than FreeBSD 7.1 release which should be:

#ifdef FreeBSD_version < 701000

Source: ​http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html

Other than that, I believe my patch is correct. One thing is I made it per signal test configurable for maximum flexibility at the cost of #ifdef ugliness. The other patch just skipped the tests altogether. I leave it up to test to do the right thing here. I believe my patch as it stands does not effect other platforms but a code review would be nice (since I myself found one bug!).