make compileable on glibc 2.0 systems (have no execinfo.h and backtrace()). Also remove unused variable warning.
make compileable on glibc 2.0 systems (have no execinfo.h and backtrace()).
Also remove unused variable warning.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@5784 27541ba8-7e3a-0410-8455-c3a389f83636

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