util: Move ralloc to a new src/util directory.

For a long time, we've wanted a place to put utility code which isn't
directly tied to Mesa or Gallium internals.  This patch creates a new
src/util directory for exactly that purpose, and builds the contents as
libmesautil.la.

ralloc seemed like a good first candidate.  These days, it's directly
used by mesa/main, i965, i915, and r300g, so keeping it in src/glsl
didn't make much sense.

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

v2 (Jason Ekstrand): More realloc uses and some scons fixes

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

src/util/SConscript

@@ -0,0 +1,26 @@
+import common
+
+Import('*')
+
+from sys import executable as python_cmd
+
+env = env.Clone()
+
+env.Prepend(CPPPATH = [
+    '#include',
+    '#src/mesa',
+    '#src/util',
+])
+
+# parse Makefile.sources
+source_lists = env.ParseSourceList('Makefile.sources')
+
+mesautil_sources = source_lists['MESA_UTIL_FILES']
+
+mesautil = env.ConvenienceLibrary(
+    target = 'mesautil',
+    source = mesautil_sources,
+)
+
+env.Alias('mesautil', mesautil)
+Export('mesautil')