Fix: Redefining HAVE_DUP at Python 3.11

[ichizok]

Python 3.11 defines HAVE_DUP at pyconfig.h, so should set undef HAVE_DUP at if_python3.c to avoid redefining.

gcc -c -I. -I/usr/local/share/asdf/installs/python/3.11.0/include/python3.11 -pthread -DDYNAMIC_PYTHON3_DLL=\"libpython3.11.so.1.0\" -Iproto -DHAVE_CONFIG_H   -DWE_ARE_PROFILING
 -Wall -Wextra -Wshadow -Wno-unknown-pragmas -g -ggdb3 -O0  -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -Wall -Wextra -Wshadow -Werror -Wno-error=maybe-uninitialized
   -o objects/if_python3.o if_python3.c
In file included from /usr/local/share/asdf/installs/python/3.11.0/include/python3.11/Python.h:12,
                 from if_python3.c:69:
/usr/local/share/asdf/installs/python/3.11.0/include/python3.11/pyconfig.h:292: error: "HAVE_DUP" redefined [-Werror]
  292 | #define HAVE_DUP 1
      |
In file included from vim.h:244,
                 from if_python3.c:32:
os_unix.h:481: note: this is the location of the previous definition
  481 | # define HAVE_DUP               // have dup()
      |

[codecov]

Codecov Report

Merging #11484 (6698219) into master (7a7db04) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11484   +/-   ##
=======================================
  Coverage   81.82%   81.82%           
=======================================
  Files         162      162           
  Lines      189746   189746           
  Branches    43135    43135           
=======================================
+ Hits       155253   155268   +15     
+ Misses      21923    21906   -17     
- Partials    12570    12572    +2     

Flag	Coverage Δ
huge-clang-none	82.73% <ø> (+<0.01%)	⬆️
huge-gcc-none	54.66% <ø> (+<0.01%)	⬆️
huge-gcc-testgui	53.10% <ø> (+<0.01%)	⬆️
huge-gcc-unittests	0.29% <ø> (ø)
linux	82.50% <ø> (+<0.01%)	⬆️
mingw-x64-HUGE	76.43% <ø> (+<0.01%)	⬆️
mingw-x86-HUGE	77.29% <ø> (+0.01%)	⬆️
windows	78.09% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/if_python3.c	74.03% <ø> (ø)
src/netbeans.c	72.30% <0.00%> (-0.15%)	⬇️
src/gui.c	72.82% <0.00%> (-0.10%)	⬇️
src/channel.c	83.72% <0.00%> (-0.09%)	⬇️
src/buffer.c	87.05% <0.00%> (-0.08%)	⬇️
src/gui_w32.c	37.17% <0.00%> (-0.08%)	⬇️
src/search.c	85.14% <0.00%> (-0.05%)	⬇️
src/term.c	73.82% <0.00%> (+0.14%)	⬆️
src/if_xcmdsrv.c	76.88% <0.00%> (+0.17%)	⬆️
src/message.c	78.95% <0.00%> (+0.22%)	⬆️
... and 3 more

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