util: Move the open-addressing linear-probing hash_table to src/util.

This hash table is used in core Mesa, the GLSL compiler, and the i965
driver, which makes it a good candidate for the new src/util module.

It's much faster than program/hash_table.[ch] (see commit 6991c2922f
for data), and José's u_hash_table.c has a comment saying Gallium should
probably consider switching to a linear probing hash table at some point.
So this seems like the best candidate for a shared data structure.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>

v2 (Jason Ekstrand): Pick up another hash_table use and patch up scons

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/glsl/SConscript

@@ -58,7 +58,6 @@ if env['msvc']:
 
 # Copy these files to avoid generation object files into src/mesa/program
 env.Prepend(CPPPATH = ['#src/mesa/main'])
-env.Command('hash_table.c', '#src/mesa/main/hash_table.c', Copy('$TARGET', '$SOURCE'))
 env.Command('imports.c', '#src/mesa/main/imports.c', Copy('$TARGET', '$SOURCE'))
 # Copy these files to avoid generation object files into src/mesa/program
 env.Prepend(CPPPATH = ['#src/mesa/program'])
@@ -68,7 +67,6 @@ env.Command('symbol_table.c', '#src/mesa/program/symbol_table.c', Copy('$TARGET'
 compiler_objs = env.StaticObject(source_lists['GLSL_COMPILER_CXX_FILES'])
 
 mesa_objs = env.StaticObject([
-    'hash_table.c',
     'imports.c',
     'prog_hash_table.c',
     'symbol_table.c',