Log Message:
py-glad2: update to 2.0.6.

What's Changed

    Fix eglplatform in header only build not correctly replacing the khrplatform \ 
include
    Fix compile warning when GLAD_GLES2_USE_SYSTEM_EGL=1 by @halx99 in #456
    Fix: Use include instead of find_package for CMake config by @spnda in #457
    c: don't warn on undefined GLAD_GLES2_USE_SYSTEM_EGL by @haasn in #461