meson: fix i965/anv/isl genX static lib names

Shouldn't make any functional difference, just that `liblibanv_gen90.a`
will now be called `libanv_gen90.a`.

Fixes: 3218056e0e "meson: Build i965 and dri stack"
Fixes: d1992255bb "meson: Add build Intel "anv" vulkan driver"
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

src/intel/isl/meson.build

@@ -54,7 +54,7 @@ foreach g : [['40', isl_gen4_files], ['50', []], ['60', isl_gen6_files],
              ['90', isl_gen9_files], ['100', []], ['110', []]]
   _gen = g[0]
   isl_gen_libs += static_library(
-    'libisl_gen@0@'.format(_gen),
+    'isl_gen@0@'.format(_gen),
     [g[1], isl_gen_files, gen_xml_pack],
     include_directories : [inc_common, inc_intel],
     c_args : [c_vis_args, no_override_init_args,

src/intel/vulkan/meson.build

@@ -95,7 +95,7 @@ foreach g : [['70', ['gen7_cmd_buffer.c']], ['75', ['gen7_cmd_buffer.c']],
              ['100', ['gen8_cmd_buffer.c']], ['110', ['gen8_cmd_buffer.c']]]
   _gen = g[0]
   libanv_gen_libs += static_library(
-    'libanv_gen@0@'.format(_gen),
+    'anv_gen@0@'.format(_gen),
     [anv_gen_files, g[1], anv_entrypoints[0], anv_extensions_h],
     include_directories : [
       inc_common, inc_compiler, inc_drm_uapi, inc_intel, inc_vulkan_util,

src/mesa/drivers/dri/i965/meson.build

@@ -138,7 +138,7 @@ files_i965 = files(
 i965_gen_libs = []
 foreach v : ['40', '45', '50', '60', '70', '75', '80', '90', '100', '110']
   i965_gen_libs += static_library(
-    'libi965_gen@0@'.format(v),
+    'i965_gen@0@'.format(v),
     ['genX_blorp_exec.c', 'genX_state_upload.c', gen_xml_pack],
     include_directories : [inc_common, inc_intel, inc_dri_common],
     c_args : [