[bug #43569] Fix for compile warnings with gcc 4.6.3

[Bjarni Ingi Gislason]

Follow-up Comment #9, bug #43569 (project groff):

Already applied changes concerning the file "diff-file":

  for src/preproc/post-html.cpp fixed in

commit 8f9d3f2c88cc1fdf787c0638abb99e2cefd13e64
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Dec 31 08:03:44 2021 +1100

  for src/libs/libgroff/font.cpp fixed in

commit 8b2e692af9493d7201667485ef7ee2632cdafa5c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Aug 24 22:07:40 2021 +1000

 and

commit 66b45cef887999fbd1b20cb4c36f2f4f029caf82
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Sep 19 08:00:33 2021 +1000

  for src/libs/libgroff/Makefile.sub; does not exist any more.

  for src/libs/libgroff/new.cpp; is unchanged, does not show a warning
with gcc 11.2.0

####

  Warnings still shown:

  for src/preproc/grn/hdb.cpp

ignoring return value of 'int fscanf(FILE*, const char*, ...)' declared
with attribute 'warn_unused_result' [-Wunused-result]

  and

ignoring return value of 'char* fgets(char*, int, FILE*)' declared with
attribute 'warn_unused_result' [-Wunused-result]

  for src/preproc/pic/pic.ypp

ignoring return value of 'int system(const char*)' declared with
attribute 'warn_unused_result' [-Wunused-result]


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