Charlotte Pabst be6b49449c mesa: clear program info when updating program string
The program info contains all sorts of flags concerning the compilation state of
the program, and those need to be reset when the program is going to be recompiled
when its source changes.

For example, before this change, after info.flrp_lowered got set following the
first call to glProgramStringARB, flrp lowering would not happen for any subsequent
updates to the program string, leading to compilation failures.

Signed-off-by: Charlotte Pabst <cpabst@codeweavers.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35523>
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


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------

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---------------

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