meson: Remove completed or irrelevant TODO comments

These are all either done already, or are autotools specific. The
misspelled gallium G3DVL is the autotools specific bit, meson is
handling that via build_by_default.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

meson.build

@@ -535,13 +535,6 @@ endif
 # TODO: powr8
 # TODO: shared/static? Is this even worth doing?
 
-# I don't think that I need to set any of the debug stuff, I think meson
-# handles that for us
-
-# TODO: ldflags
-
-# TODO: texture-float (gallium/mesa only)
-
 # Building x86 assembly code requires running x86 binaries. It is possible for
 # x86_64 OSes to run x86 binaries, so don't disable asm in those cases
 # TODO: it should be possible to use an exe_wrapper to run the binary during
@@ -788,12 +781,8 @@ else
   dep_unwind = []
 endif
 
-# TODO: flags for opengl, gles, dri
-
 # TODO: gallium-hud
 
-# TODO: glx provider
-
 if with_osmesa != 'none'
   if with_osmesa == 'classic' and not with_dri_swrast
     error('OSMesa classic requires dri (classic) swrast.')
@@ -886,10 +875,6 @@ if with_platform_x11
   endif
 endif
 
-# TODO: osmesa
-
-# TODO: vallium G3DVL
-
 # TODO: nine
 
 # TODO: clover