Specify c++ standard to use for building libktx. (#806) #464

Job	Run time
windows (windows-latest, v143, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, ON, YES, ON...	1h 43m 39s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	4m 49s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	4m 41s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	49m 19s
windows (windows-latest, CLangCL, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, ON, YES,...	30m 52s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	6m 17s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	9m 14s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	58m 21s
windows (windows-2019, v142, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, ON, NO, ON, O...	23m 18s
windows (windows-latest, CLangCL, arm64, Debug,Release, ON, ON, OpenGL, OFF, ON, ON, ON, YES, Vis...	34m 31s
	5h 25m 1s

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