i965: Rename INTEL_DEBUG=vec4vs to INTEL_DEBUG=vec4.

driParseDebugString() doesn't have actual code to parse comma separated
lists (or any other supported options?); instead it dumbly uses strstr().

This means that INTEL_DEBUG="vec4vs" will trigger both DEBUG_VEC4VS and
DEBUG_VS, as "vs" is also a substring.

We should probably improve the driconf parsing, but for now, just rename
the option so it's usable in the meantime.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Jason Ekstrand <jason.ekstrand@intel.com>
Acked-by: Kristian Høgsberg <krh@bitplanet.net>

src/mesa/drivers/dri/i965/intel_debug.c

@@ -68,7 +68,7 @@ static const struct dri_debug_control debug_control[] = {
    { "optimizer",   DEBUG_OPTIMIZER },
    { "ann",         DEBUG_ANNOTATION },
    { "no8",         DEBUG_NO8 },
-   { "vec4vs",      DEBUG_VEC4VS },
+   { "vec4",        DEBUG_VEC4VS },
    { "spill",       DEBUG_SPILL },
    { "cs",          DEBUG_CS },
    { NULL,    0 }