RFC Add --disable-werror to gdb, etc

[Joel Sherrill]

Hi

On Cygwin with gcc 11.3.0 as the native compiler, the build of gdb fails
with:

  CXX    cp-name-parser.o
../../gdb-11.2/gdb/completer.c: In function ‘char*
gdb_completion_word_break_characters_throw()’:
../../gdb-11.2/gdb/completer.c:2014:10: error: invalid conversion from
‘const char*’ to ‘char*’ [-fpermissive]
 2014 |   return rl_completer_word_break_characters;
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |          |
      |          const char*
make[2]: *** [Makefile:1641: completer.o] Error 1

Do we want to chase these?  When we lock down tool versions and host
compilers continue to improve, we are just begging for having to fix these
types of issues. We have enough warnings of our own to fix. :)

I'd like to add --disable-werror to at least the default gdb build. And
suggest we consider for any other package that has enable-werror by default.

Thoughts.

--joel
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