irc/znc: Allow build with swig 4.1.0+

PR:		270720
Obtained from:	znc/znc@fecdd98

irc/znc/files/patch-swig

@@ -0,0 +1,33 @@
+Obtained from:	https://github.com/znc/znc/commit/fecdd9895894b3afe903021b0843a422eb4d3308
+
+--- CMakeLists.txt.orig	2023-04-11 14:26:05 UTC
++++ CMakeLists.txt
+@@ -173,7 +173,7 @@ if(WANT_PYTHON AND NOT EXISTS
+ 	endif()
+ endif()
+ if(search_swig)
+-	find_package(SWIG 3.0.0)
++	find_package(SWIG 4.0.1)
+ 	if(NOT SWIG_FOUND)
+ 		message(FATAL_ERROR
+ 			"Can't find SWIG, therefore Perl and Python aren't supported. "
+--- modules/modperl/CMakeLists.txt.orig	2020-09-07 22:57:50 UTC
++++ modules/modperl/CMakeLists.txt
+@@ -53,7 +53,6 @@ if(SWIG_FOUND)
+ 		"-I${PROJECT_SOURCE_DIR}/include"
+ 		"-I${CMAKE_CURRENT_SOURCE_DIR}/.."
+ 		"-I${CMAKE_CURRENT_SOURCE_DIR}/include"
+-		-DZNC_EXPORT_LIB_EXPORT
+ 		-outdir "${CMAKE_CURRENT_BINARY_DIR}"
+ 		-o "${CMAKE_CURRENT_BINARY_DIR}/modperl_biglib.cpp"
+ 		"${CMAKE_CURRENT_SOURCE_DIR}/modperl.i"
+--- modules/modpython/CMakeLists.txt.orig	2020-09-07 22:57:50 UTC
++++ modules/modpython/CMakeLists.txt
+@@ -50,7 +50,6 @@ if(SWIG_FOUND)
+ 		"-I${PROJECT_BINARY_DIR}/include"
+ 		"-I${PROJECT_SOURCE_DIR}/include"
+ 		"-I${CMAKE_CURRENT_SOURCE_DIR}/.."
+-		-DZNC_EXPORT_LIB_EXPORT
+ 		-outdir "${CMAKE_CURRENT_BINARY_DIR}"
+ 		-o "${CMAKE_CURRENT_BINARY_DIR}/modpython_biglib.cpp"
+ 		"${CMAKE_CURRENT_SOURCE_DIR}/modpython.i"