Drop discoverable_partition_specification hunk merged upstream in 1.15.2

The first hunk of the riscv64 patch adds an else-if branch to
this_arch_root() in
crates/lib/src/discoverable_partition_specification.rs. Upstream bootc
accepted the same change in commit 47c3620 ("fix: add riscv64 to
this_arch_root"), shipped in v1.15.2. As a result the hunk now matches
already-applied code and `patch -f --fuzz=0` fails the whole %prep,
breaking build #56177 on every arch.

Drop that hunk; keep the two install.rs / install/baseline.rs hunks,
which upstream still does not have.

files/0001-Add-riscv64-architecture-support.patch

@@ -8,30 +8,20 @@ RISC-V uses UEFI boot like aarch64, so no special bootloader partition
 is needed.
 
 Changes:
-- discoverable_partition_specification: add riscv64 to this_arch_root()
 - install: add riscv64 to ARCH_USES_EFI
 - install/baseline: add riscv64 to partitioning arch checks
 
+Note: the riscv64 branch in this_arch_root() (in
+crates/lib/src/discoverable_partition_specification.rs) was accepted
+upstream in bootc commit 47c3620 ("fix: add riscv64 to this_arch_root")
+and is already present in v1.15.2, so it is no longer carried here.
+
 Signed-off-by: Andrew Lukoshko <alukoshko@almalinux.org>
 ---
- crates/lib/src/discoverable_partition_specification.rs | 2 ++
- crates/lib/src/install.rs                             | 2 +-
- crates/lib/src/install/baseline.rs                    | 2 +-
- 3 files changed, 4 insertions(+), 2 deletions(-)
+ crates/lib/src/install.rs          | 2 +-
+ crates/lib/src/install/baseline.rs | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
 
-diff --git a/crates/lib/src/discoverable_partition_specification.rs b/crates/lib/src/discoverable_partition_specification.rs
-index d5432e7..344b232 100644
---- a/crates/lib/src/discoverable_partition_specification.rs
-+++ b/crates/lib/src/discoverable_partition_specification.rs
-@@ -457,6 +457,8 @@ pub const fn this_arch_root() -> &'static str {
-             ROOT_PPC64
-         } else if #[cfg(all(target_arch = "powerpc64", target_endian = "little"))] {
-             ROOT_PPC64_LE
-+        } else if #[cfg(target_arch = "riscv64")] {
-+            ROOT_RISCV64
-         } else {
-             compile_error!("Unsupported architecture")
-         }
 diff --git a/crates/lib/src/install.rs b/crates/lib/src/install.rs
 index 105e2b3..052b208 100644
 --- a/crates/lib/src/install.rs
@@ -60,3 +50,4 @@ index d05604e..34d3187 100644
          anyhow::bail!("Unsupported architecture: {}", std::env::consts::ARCH);
 -- 
 2.43.0
+