xf86-video-ast: Changes to 'master'

[Y.C. Chen]

 src/ast.h         |    1 
 src/ast_2dtool.c  |    3 
 src/ast_accel.c   |    4 
 src/ast_driver.c  |   10 -
 src/ast_mode.c    |  143 ++++++++++++---
 src/ast_mode.h    |    1 
 src/ast_vgatool.c |  510 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 7 files changed, 627 insertions(+), 45 deletions(-)

New commits:
commit 74281c4ce201ff04a6672c703d09ed28286f1801
Author: Y.C. Chen <yc_chen at aspeedtech.com>
Date:   Fri Aug 14 15:30:00 2015 +0800

    Support AST2500