Log Message:
unbreak octave on NetBSD

Change the way iconv_t void* conflict is handled
using a patch from upstream to fix PR pkg/56240 .
Due to the above remove
patch-libinterp_corefcn_input.cc and
patch-liboctave_wrappers_iconv-wrappers.h .
Execute autoconf in the configuration step so that
patch-configure.ac and patch-m4_acinclude.m4 is
actually used.
Change the PLIST so that -gnu is not used
references in patch-m4_acinclude.m4 mentions this.
Explicitly don't generate any docs since
generation octave.pdf breaks and it already exists.
Install info and man pages manually since they are
not installed due to docs not being generated.
Bump pkgrevision due to PLIST change.