rust: hide warnings for subprojects

This matches cargo's own usage of "--cap-lints allow" when building
dependencies.  The dummy changes to the .wrap files help Meson notice
that the subproject is out of date.

Also remove an unnecessary subprojects/unicode-ident-1-rs/meson.build file.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

subprojects/packagefiles/arbitrary-int-1-rs/meson.build

@@ -9,6 +9,7 @@ _arbitrary_int_rs = static_library(
   files('src/lib.rs'),
   gnu_symbol_visibility: 'hidden',
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
+  rust_args: ['--cap-lints', 'allow'],
   rust_abi: 'rust',
   dependencies: [],
 )

subprojects/packagefiles/bilge-0.2-rs/meson.build

@@ -17,6 +17,7 @@ lib = static_library(
   'src/lib.rs',
   override_options : ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi : 'rust',
+  rust_args: ['--cap-lints', 'allow'],
   dependencies: [
     arbitrary_int_dep,
     bilge_impl_dep,

subprojects/packagefiles/bilge-impl-0.2-rs/meson.build

@@ -25,6 +25,7 @@ _bilge_impl_rs = rust.proc_macro(
   files('src/lib.rs'),
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'use_fallback',
     '--cfg', 'feature="syn-error"',
     '--cfg', 'feature="proc-macro"',

subprojects/packagefiles/either-1-rs/meson.build

@@ -11,6 +11,7 @@ _either_rs = static_library(
   override_options: ['rust_std=2018', 'build.rust_std=2018'],
   rust_abi: 'rust',
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'feature="use_std"',
     '--cfg', 'feature="use_alloc"',
   ],

subprojects/packagefiles/itertools-0.11-rs/meson.build

@@ -15,6 +15,7 @@ _itertools_rs = static_library(
   override_options: ['rust_std=2018', 'build.rust_std=2018'],
   rust_abi: 'rust',
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'feature="use_std"',
     '--cfg', 'feature="use_alloc"',
   ],

subprojects/packagefiles/proc-macro-error-1-rs/meson.build

@@ -20,6 +20,7 @@ _proc_macro_error_rs = static_library(
   override_options: ['rust_std=2018', 'build.rust_std=2018'],
   rust_abi: 'rust',
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'use_fallback',
     '--cfg', 'feature="syn-error"',
     '--cfg', 'feature="proc-macro"',

subprojects/packagefiles/proc-macro-error-attr-1-rs/meson.build

@@ -16,6 +16,7 @@ _proc_macro_error_attr_rs = rust.proc_macro(
   files('src/lib.rs'),
   override_options: ['rust_std=2018', 'build.rust_std=2018'],
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'use_fallback',
     '--cfg', 'feature="syn-error"',
     '--cfg', 'feature="proc-macro"'

subprojects/packagefiles/proc-macro2-1-rs/meson.build

@@ -15,6 +15,7 @@ _proc_macro2_rs = static_library(
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'feature="proc-macro"',
     '--cfg', 'no_literal_byte_character',
     '--cfg', 'no_literal_c_string',

subprojects/packagefiles/quote-1-rs/meson.build

@@ -15,6 +15,7 @@ _quote_rs = static_library(
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'feature="proc-macro"',
   ],
   dependencies: [

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

@@ -19,6 +19,7 @@ _syn_rs = static_library(
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
   rust_args: [
+    '--cap-lints', 'allow',
     '--cfg', 'feature="full"',
     '--cfg', 'feature="derive"',
     '--cfg', 'feature="parsing"',

subprojects/packagefiles/unicode-ident-1-rs/meson.build

@@ -10,6 +10,7 @@ _unicode_ident_rs = static_library(
   gnu_symbol_visibility: 'hidden',
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
+  rust_args: ['--cap-lints', 'allow'],
   dependencies: [],
   native: true,
 )