[RFA] "etext/_etext" may be missing, add configure check

[Joel Brobecker]

> Oh well, there is still a little bit of a gain, since GDB now builds
> on LynxOS too.  Adding the native part shouldn't be too hard if anyone
> is interested.

Actually, while reviewing the changes that I made as I'm backing them
up before discarding, there is one tiny bit that also needs to be done
for GDB to build. I am posting it mostly for completeness than anything
else I'm not sure want to add lynxos-specific stuff unless someone wants
gdb-hosted support - no point in doing something is noone is going to
use it!

-- 
Joel
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Index: configure.host
===================================================================
--- configure.host	(revision 14490)
+++ configure.host	(working copy)
@@ -112,6 +112,7 @@ mips64*-*-openbsd*)	gdb_host=obsd64 ;;
 
 powerpc-*-aix*)		gdb_host=aix ;;
 powerpc-*-linux*)	gdb_host=linux ;;
+powerpc-*-lynxos*)	gdb_host=lynxos ;;
 powerpc-*-netbsd* | powerpc-*-knetbsd*-gnu)
 			gdb_host=nbsd ;;
 powerpc-*-openbsd*)	gdb_host=obsd ;;
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LOADLIBES = -lbsd