util/xmlconfig: drop driInjectDataDir() now that DRIRC_CONFIGDIR is always supported

Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21808>

src/util/tests/xmlconfig.cpp

@@ -191,11 +191,6 @@ xmlconfig_test::drirc_init(const char *driver, const char *drm,
                            const char *app, int appver,
                            const char *engine, int enginever)
 {
-   /* Make the parser look in the directory of config files for the test,
-    * passed in by meson.build.
-    */
-   driInjectDataDir(getenv("DRIRC_CONFIGDIR"));
-
    driInjectExecName(exec_name);
 
    driOptionDescription driconf[] = {

src/util/xmlconfig.c

@@ -1176,12 +1176,6 @@ initOptionCache(driOptionCache *cache, const driOptionCache *info)
 static const char *datadir = DATADIR "/drirc.d";
 static const char *execname;
 
-void
-driInjectDataDir(const char *dir)
-{
-   datadir = dir;
-}
-
 void
 driInjectExecName(const char *exec)
 {

src/util/xmlconfig.h

@@ -159,7 +159,6 @@ float driQueryOptionf(const driOptionCache *cache, const char *name);
 char *driQueryOptionstr(const driOptionCache *cache, const char *name);
 
 /* Overrides for the unit tests to control drirc parsing. */
-void driInjectDataDir(const char *dir);
 void driInjectExecName(const char *exec);
 
 /**