meson: remove dri-search-path

It's not actually used anywhere.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31223>

meson.build

@@ -91,10 +91,6 @@ dri_drivers_path = get_option('dri-drivers-path')
 if dri_drivers_path == ''
   dri_drivers_path = join_paths(get_option('prefix'), get_option('libdir'), 'dri')
 endif
-dri_search_path = get_option('dri-search-path')
-if dri_search_path == ''
-  dri_search_path = dri_drivers_path
-endif
 
 gbm_backends_path = get_option('gbm-backends-path')
 if gbm_backends_path == ''

meson_options.txt

@@ -66,14 +66,6 @@ option(
                 'Do not enable unless you know what you are doing. Default: false'
 )
 
-option(
-  'dri-search-path',
-  type : 'string',
-  value : '',
-  description : 'Locations to search for dri drivers, passed as colon ' +
-                'separated list. Default: dri-drivers-path.'
-)
-
 option(
   'expat',
   type : 'feature',

src/loader/meson.build

@@ -21,7 +21,6 @@ endif
 
 loader_c_args = [
   '-DUSE_DRICONF',
-  '-DDEFAULT_DRIVER_DIR="@0@"'.format(dri_search_path),
 ]
 libloader = static_library(
   'loader',