egl: Unify the EGLint/EGLAttrib paths in eglCreateSync* (v3)

Pre-patch, there were two code paths for parsing EGLSync attribute
lists: one path for old-style EGLint lists, used by eglCreateSyncKHR,
and another for new-style EGLAttrib lists, used by eglCreateSync (1.5)
and eglCreateSync64 (EGL_KHR_cl_event2).

There were two attrib_list parsing functions,
  _eglParseSyncAttribList(_EGLSync *sync, const EGLint *attrib_list)
  _eglParseSyncAttribList64(_EGLSync *sync, const EGLattrib *attrib_list)
This patch unifies the two attrib_list parsing functions into one,
  _eglParseSyncAttribList(_EGLSync *sync, const EGLattrib *attrib_list)

Many internal EGLSync function signatures had *two* attrib_list
parameters to accomodate both code paths: one parameter was an EGLint
list and other an EGLAttrib list. At most one of the parameters was
allowed to be non-null.  This patch removes the `EGLint *attrib_list`
parameter, leaving only the `EGLAttrib *attrib_list` parameter, for all
internal EGLSync functions.

v2:
  - Consistently use condition (sizeof(int_list[0]) ==
    sizeof(attrib_list[0])). [for emil]
v3:
  - Don't double-unlock the display in eglCreateSyncKHR.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com> (v2)
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 803627d..cd0a2e9 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -2509,8 +2509,7 @@
 
 static _EGLSync *
 dri2_create_sync(_EGLDriver *drv, _EGLDisplay *dpy,
-                 EGLenum type, const EGLint *attrib_list,
-                 const EGLAttrib *attrib_list64)
+                 EGLenum type, const EGLAttrib *attrib_list)
 {
    _EGLContext *ctx = _eglGetCurrentContext();
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(dpy);
@@ -2525,8 +2524,7 @@
       return NULL;
    }
 
-   if (!_eglInitSync(&dri2_sync->base, dpy, type, attrib_list,
-                     attrib_list64)) {
+   if (!_eglInitSync(&dri2_sync->base, dpy, type, attrib_list)) {
       free(dri2_sync);
       return NULL;
    }