linux fix SFML_DIR #163

Job	Run time
release (macos, -intel, x86_64, macos-universal, 12, ./.github/workflows/scripts/mac/scons-build....	5m 30s
release (macos, -intel, x86_64, macos-universal, 12, ./.github/workflows/scripts/mac/scons-build....	5m 1s
release (macos, arm64, -silicon, macos-universal, 14, ./.github/workflows/scripts/mac/scons-build...	3m 54s
release (macos, arm64, -silicon, macos-universal, 14, ./.github/workflows/scripts/mac/scons-build...	3m 33s
release (ubuntu, 22.04, scons, Release)	35s
release (ubuntu, 22.04, scons, Debug)	40s
release (windows, 2019, ./.github/workflows/scripts/win/scons-build.bat, Release)	4m 53s
release (windows, 2019, ./.github/workflows/scripts/win/scons-build.bat, Debug)	4m 40s
	28m 46s

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