st/mesa: change SQRT lowering to fix the game Risen
st/mesa: change SQRT lowering to fix the game Risen

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94627
(against nouveau)

Acked-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler