Fix build failure on git master

[Stef Walter]

Hi there,

gnutls git master fails (for me) with the following message:

certtool-args.c:55:13: error: conflicting types for 'optionAlias'
In file included from certtool-args.h:49:0,
                 from certtool-args.c:48:
../src/libopts/autoopts/options.h:1031:12: note: previous declaration of
'optionAlias' was here
make[3]: *** [libcmd_certtool_la-certtool-args.lo] Error 1
make[3]: Leaving directory `/data/projects/gnutls/src'

Patch attached.

In addition configure.ac doesn't check for the 'autogen' tool, and so in
its absence one gets failures later on in the build.

Cheers,

Stef
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