meson: drop unused variables

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32333>

src/egl/meson.build

@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: MIT
 
 inc_egl = include_directories('.', 'main')
-inc_egl_dri2 = include_directories('drivers/dri2')
 
 c_args_for_egl = [asan_c_args]
 cpp_args_for_egl = []

src/gbm/backends/dri/meson.build

@@ -8,7 +8,7 @@ if with_platform_wayland
   incs_gbm_dri += inc_wayland_drm
 endif
 
-libgbm_dri = shared_library(
+shared_library(
   'dri_gbm',
   files('gbm_dri.c', 'gbm_driint.h'),
   include_directories : [incs_gbm, incs_gbm_dri, inc_st_dri, inc_gallium_aux],

src/gfxstream/guest/meson.build

@@ -34,7 +34,6 @@ endif
 # Includes      #
 #===============#
 
-inc_include_mesa = include_directories('../../../include')
 inc_vulkan_headers = include_directories('../../../include/vulkan')
 inc_vulkan_enc = include_directories('vulkan_enc')
 

src/vulkan/device-select-layer/meson.build

@@ -19,7 +19,7 @@ if with_platform_wayland
    vklayer_deps += dep_wayland_client
 endif
 
-vklayer_mesa_device_select = shared_library(
+shared_library(
   'VkLayer_MESA_device_select',
   vklayer_files,
   c_args : [no_override_init_args, vklayer_flags],