[PATCH] waf: fetch and use some exit codes of called processes

[Bjoern Baumbach]

Hi!

Running for example "make ctags" reports
"'ctags' finished successfully ...", even if ctags is not available or
does not exit with 0.

With the attached patch the exit codes of the called processes by
os.system() in the wscript will be fetched.

Björn

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