etnaviv: build dependency for the etnaviv tests

Resolves failures as:
... -o src/etnaviv/isa/tests/etnaviv_disasm.p/disasm.cpp.o -c ../src/etnaviv/isa/tests/disasm.cpp
In file included from ../src/etnaviv/isa/tests/disasm.cpp:12:
../src/etnaviv/isa/asm.h:15:10: fatal error: etnaviv/isa/enums.h: No such file or directory
   15 | #include "etnaviv/isa/enums.h"
      |          ^~~~~~~~~~~~~~~~~~~~~

Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11740
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30829>
(cherry picked from commit 8f8a51ac5c)

.pick_status.json

@@ -864,7 +864,7 @@
         "description": "etnaviv: build dependency for the etnaviv tests",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/etnaviv/isa/meson.build

@@ -56,6 +56,11 @@ etnaviv_enums_h = custom_target(
   depend_files: isa_depend_files,
 )
 
+idep_etnaviv_enums_h = declare_dependency(
+  sources : [etnaviv_enums_h],
+  include_directories : include_directories('.'),
+)
+
 encode_h = custom_target(
   'encode.h',
   input: ['etnaviv.xml'],

src/etnaviv/isa/tests/meson.build

@@ -8,6 +8,6 @@ test(
   executable(
     'etnaviv_disasm', 'disasm.cpp',
     include_directories: [inc_etnaviv, inc_src],
-    dependencies : [idep_gtest, idep_libetnaviv_decode],
+    dependencies : [idep_gtest, idep_etnaviv_enums_h, idep_libetnaviv_decode],
   )
 )