progs/gallium/python: New home for python statetracker scripts.

progs/gallium/python/tests/regress/vertex-shader/vert-srcmod-absneg.sh

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+VERT
+
+DCL IN[0], POSITION
+DCL IN[1], COLOR
+DCL OUT[0], POSITION
+DCL OUT[1], COLOR
+DCL TEMP[0]
+
+IMM FLT32 { -0.2, -0.2, 0.0, 0.0 }
+
+ADD TEMP[0], IN[0], IMM[0]
+MOV OUT[0].xy, -|TEMP[0]|
+MOV OUT[0].zw, IN[0]
+MOV OUT[1], IN[1]
+
+END