Backport 80476.

Backport 80476.

ecore-wayland: Fix monitoring ECORE_FD_WRITE defaultly on
               wayland display fd lead to 100% cpu usage

In ecore_wl_init(), adding wayland display fd with ECORE_FD_WRITE
flag make CPU usage 100%. The proper way to monitor the ECORE_FD_WRITE
is when the wl_display_flush() return value < 0 and errno == EAGAIN.
And if wl_display_flush() return, we remove ECORE_FD_WRITE flag from
the display fd.

Patch by: Alex Wu <zhiwen.wu@linux.intel.com>

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/branches/ecore-1.7@80479 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33