Current thread management was initialized in _eglInitGlobals, which is
called only in eglGetDisplay. Since EGL does not require eglGetDisplay
to be called first, the initialization is better to be done on demand.
_eglFiniCurrent is removed, as it is not called at all.
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
This commit introduces a "current" system to manage per-thread info. It
uses TLS, if GLX_USE_TLS is defined, or pthread, if PTHREADS is defined.
If none of them are defined, it uses a dummy implementation that is just
like before.
Signed-off-by: Chia-I Wu <olvaffe@gmail.com>