[gimp] build: removing OpenBlas patches.

[Jehan <jehanp src gnome org>]

commit 0aca0333702e799423161eeb94485e4a2fc53361
Author: Jehan <jehan girinstud io>
Date:   Mon Apr 20 23:50:43 2020 +0200

    build: removing OpenBlas patches.
    
    Our installer use Msys2 packages when possible. And Msys2 repository
    provides version 0.3.9, released on March 2, which contains our patches.
    No need for them here anymore, no need to make custom builds.

 ...f-TerminateThread-causing-critical-sectio.patch | 56 ----------------------
 ...-reasonable-thread-wait-timeout-on-Window.patch | 31 ------------
 2 files changed, 87 deletions(-)