fix build under newer KConfig by bump cmake min version

3rdparty/lexilla540/lexilla/README

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+README for Lexilla library.
+
+The Lexilla library contains a set of lexers and folders that provides support for
+programming, mark-up, and data languages for the Scintilla source code editing
+component.
+
+Lexilla is made available as both a shared library and static library.
+The shared library is called liblexilla.so / liblexilla.dylib / lexilla.dll on Linux / macOS /
+Windows.
+The static library is called liblexilla.a when built with GCC or Clang and liblexilla.lib
+when built with MSVC.
+
+Lexilla is developed on Windows, Linux, and macOS and requires a C++17 compiler.
+It may work on other Unix platforms like BSD but that is not a development focus.
+MSVC 2019.4, GCC 9.0, Clang 9.0, and Apple Clang 11.0 are known to work.
+
+MSVC is only available on Windows.
+
+GCC and Clang work on Windows and Linux.
+
+On macOS, only Apple Clang is available.
+
+Lexilla requires some headers from Scintilla to build and expects a directory named
+"scintilla" containing a copy of Scintilla 5+ to be a peer of the Lexilla top level
+directory conventionally called "lexilla".
+
+To use GCC, run lexilla/src/makefile:
+	make
+
+To use Clang, run lexilla/test/makefile:
+	make CLANG=1
+On macOS, CLANG is set automatically so this can just be
+	make
+
+To use MSVC, run lexilla/test/lexilla.mak:
+	nmake -f lexilla.mak
+
+To build a debugging version of the library, add DEBUG=1 to the command:
+	make DEBUG=1
+	
+The built libraries are copied into lexilla/bin.
+
+Lexilla relies on a list of lexers from the lexilla/lexers directory. If any changes are
+made to the set of lexers then source and build files can be regenerated with the
+lexilla/scripts/LexillaGen.py script which requires Python 3 and is tested with 3.7+.
+Unix:
+	python3 LexillaGen.py
+Windows:
+	pyw LexillaGen.py