rust: let bilge use "let ... else"

"let ... else" was stabilized in 1.65.0; bumping the minimum supported
Rust version means we don't need to patch it out anymore.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

docs/devel/rust.rst

@@ -76,9 +76,6 @@ are missing:
 
 * ``cast_mut()``/``cast_const()`` (1.65.0).  Use ``as`` instead.
 
-* "let ... else" (1.65.0).  Use ``if let`` instead.  This is currently patched
-  in QEMU's vendored copy of the bilge crate.
-
 * Generic Associated Types (1.65.0)
 
 * ``CStr::from_bytes_with_nul()`` as a ``const`` function (1.72.0).

subprojects/bilge-impl-0.2-rs.wrap

@@ -5,7 +5,6 @@ source_filename = bilge-impl-0.2.0.tar.gz
 source_hash = feb11e002038ad243af39c2068c8a72bcf147acf05025dcdb916fcc000adb2d8
 #method = cargo
 patch_directory = bilge-impl-0.2-rs
-diff_files = bilge-impl-1.63.0.patch
 
 # bump this version number on every change to meson.build or the patches:
 # v2

subprojects/packagefiles/bilge-impl-1.63.0.patch

@@ -1,45 +0,0 @@
---- a/src/shared/discriminant_assigner.rs
-+++ b/src/shared/discriminant_assigner.rs
-@@ -26,20 +26,20 @@
-         let discriminant_expr = &discriminant.1;
-         let variant_name = &variant.ident;
- 
--        let Expr::Lit(ExprLit { lit: Lit::Int(int), .. }) = discriminant_expr else {
-+        if let Expr::Lit(ExprLit { lit: Lit::Int(int), .. }) = discriminant_expr {
-+            let discriminant_value: u128 = int.base10_parse().unwrap_or_else(unreachable);
-+            if discriminant_value > self.max_value() {
-+                abort!(variant, "Value of variant exceeds the given number of bits")
-+            }
-+
-+            Some(discriminant_value)
-+        } else {
-             abort!(
-                 discriminant_expr,
-                 "variant `{}` is not a number", variant_name;
-                 help = "only literal integers currently supported"
-             )
--        };
--
--        let discriminant_value: u128 = int.base10_parse().unwrap_or_else(unreachable);
--        if discriminant_value > self.max_value() {
--            abort!(variant, "Value of variant exceeds the given number of bits")
-         }
--
--        Some(discriminant_value)
-     }
- 
-     fn assign(&mut self, variant: &Variant) -> u128 {
---- a/src/shared/fallback.rs
-+++ b/src/shared/fallback.rs
-@@ -22,8 +22,9 @@
-             }
-             Unnamed(fields) => {
-                 let variant_fields = fields.unnamed.iter();
--                let Ok(fallback_value) = variant_fields.exactly_one() else {
--                    abort!(variant, "fallback variant must have exactly one field"; help = "use only one field or change to a unit variant")
-+                let fallback_value = match variant_fields.exactly_one() {
-+                    Ok(ok) => ok,
-+                    _ => abort!(variant, "fallback variant must have exactly one field"; help = "use only one field or change to a unit variant")
-                 };
- 
-                 if !is_last_variant {