Build

Update security policy and remove redundancy #682

Job	Run time
Ubuntu-meson	3m 56s
VisualStudio-meson	1m 23s
macOS-cmake (macos-latest)	19s
macOS (macos-14)	3m 18s
Ubuntu-cmake (ubuntu-latest)	40s
Windows-cmake (Win32, windows-latest)	1m 4s
Windows (x64, windows-latest)	1m 28s
Ubuntu (ubuntu-latest)	3m 29s
macOS-cmake (macos-14)	18s
Windows (win32, windows-latest)	1m 32s
macOS (macos-latest)	2m 44s
MSYS2-cmake (UCRT64)	2m 22s
Windows-cmake (x64, windows-latest)	52s
MSYS2-cmake (MINGW64)	2m 32s
Cygwin-cmake	3m 29s
	29m 26s

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