Fix build failure when using Swig 4.

Taken from upstream:
https://github.com/fifengine/fifengine/commit/d14f232f4cd9a00b05d6872957070e8c020f515d

diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -893,7 +893,7 @@ if(build-python)
   find_package(PythonLibs ${PYTHON_VERSION_STRING} EXACT)
   include_directories(${PYTHON_INCLUDE_PATH})
 
-  set(CMAKE_SWIG_FLAGS -modern -fastdispatch -dirvtable -nosafecstrings -noproxydel -fastproxy -fastinit -fastunpack -fastquery -modernargs -nobuildnone -keyword -w511 -w473 -w404 -w314)
+  set(CMAKE_SWIG_FLAGS -modern -fastdispatch -dirvtable -noproxydel -fastproxy -fastinit -fastunpack -fastquery -modernargs -keyword -w511 -w473 -w404 -w314)
 
   set_source_files_properties("${PROJECT_BINARY_DIR}/fife.i" PROPERTIES CPLUSPLUS ON)
   set(FIFE_SOURCES ${FIFE_CORE_SRC})
n>
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<div class='path'>path: <a href='/guix/log/?id=c35abdaeeb74770b226097a661e504bf25a914c6&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=c35abdaeeb74770b226097a661e504bf25a914c6&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/home?id=c35abdaeeb74770b226097a661e504bf25a914c6&amp;showmsg=1'>home</a>/<a href='/guix/log/gnu/home/services?id=c35abdaeeb74770b226097a661e504bf25a914c6&amp;showmsg=1'>services</a>/<a href='/guix/log/gnu/home/services/gnupg.scm?id=c35abdaeeb74770b226097a661e504bf25a914c6&amp;showmsg=1'>gnupg.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/home/services/gnupg.scm?id=c35abdaeeb74770b226097a661e504bf25a914c6'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2023-09-04 11:11:58 +0300'>2023-09-04</span></td><td class='logsubject'><a href='/guix/commit/gnu/home/services/gnupg.scm?id=1af35bbb25b122cafddfd2f69b644d46c4beff85'>home: Add parcimonie service.</a></td><td>Efraim Flashner</td></tr>
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* gnu/home/services/gnupg.scm (home-parcimonie-service-type,
home-parcimonie-configuration): New variables.
* doc/guix.texi (GNU Privacy Guard): Document it.


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<tr class='logheader'><td><span title='2023-04-08 22:56:19 +0200'>2023-04-08</span></td><td class='logsubject'><a href='/guix/commit/gnu/home/services/gnupg.scm?id=6420015e6d3300e7a73da9a8253428d8386954d6'>home: Add gpg-agent service.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/home/services/gnupg.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (GNU Privacy Guard): New node.
(Secure Shell): Link to it.


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