util: be consistent about transitive dependencies

A transitive dependency is a dependency of a dependency.
So if, for example, mesa3d_util does explicitly use
zerocopy-derive, it should not need to a depend on it.

The package that pulls in transitive should already
include it has a dependency.  This provides clearer
methodologies in maintaining Rust code, similiar to
how Cargo.toml handles it.

Reviewed-by: David Gilhooley <djgilhooley.gmail.com>

src/util/rust/meson.build

@@ -25,14 +25,7 @@ dep_zerocopy = dependency('zerocopy',
   required: true,
 )
 
-dep_zerocopy_derive = dependency('zerocopy-derive',
-  version: '>= 0.8.13',
-  fallback: ['zerocopy-derive-0.8-rs', 'dep_zerocopy_derive'],
-  required: true,
-)
-
-dep_mesa3d_util = [dep_cfg_if, dep_thiserror, dep_remain, dep_zerocopy,
-                   dep_zerocopy_derive]
+dep_mesa3d_util = [dep_cfg_if, dep_thiserror, dep_remain, dep_zerocopy]
 
 supported_systems = ['linux', 'windows', 'darwin', 'macos']
 supported_host_machine = host_machine.system() in supported_systems
@@ -44,19 +37,7 @@ if supported_host_machine
     required: true,
   )
 
-  dep_bitflags = dependency('bitflags',
-    version: '>= 2.6.0',
-    fallback: ['bitflags-2-rs', 'dep_bitflags'],
-    required: true,
-  )
-
-  dep_errno = dependency('errno',
-    version: '>= 0.3.8',
-    fallback: ['errno-0.3-rs', 'dep_errno'],
-    required: true,
-  )
-
-  dep_mesa3d_util += [dep_rustix, dep_bitflags, dep_errno]
+  dep_mesa3d_util += [dep_rustix]
 endif
 
 libmesa_rust_util = static_library(

subprojects/packagefiles/thiserror-2-rs/meson.build

@@ -22,5 +22,5 @@ lib = static_library(
 )
 
 dep_thiserror = declare_dependency(
-  link_with : [lib]
+  link_with : [lib, thiserror_impl]
 )

subprojects/packagefiles/zerocopy-0.8-rs/meson.build

@@ -21,5 +21,5 @@ lib = static_library(
 )
 
 dep_zerocopy = declare_dependency(
-  link_with : [lib]
+  link_with : [lib, zerocopy_derive]
 )