Patch from:
https://github.com/libbpf/blazesym/commit/32f136b06b8b71110499073909dd238e577b23d0

From: =?UTF-8?q?Holger=20Hoffst=C3=A4tte?= <holger@applied-asynchrony.com>
Date: Tue, 25 Mar 2025 10:10:56 +0100
Subject: [PATCH] capi: add capi feature to enable building with cargo-c
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Disable generating the header since it already exists,
and more importantly because we cannot run the required custom
cbindgen extension from cargo-c.

Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com>
--- a/capi/Cargo.toml
+++ b/capi/Cargo.toml
@@ -36,6 +36,8 @@ crate-type = ["cdylib", "staticlib", "lib"]
 default = [
   "dwarf",
 ]
+# Required by cargo-c
+capi = []
 # Check C code documentation snippets.
 check-doc-snippets = []
 # Enable this feature to enable blazesym's DWARF support.
@@ -46,6 +48,15 @@ dwarf = ["blazesym/dwarf"]
 # changed.
 generate-c-header = ["dep:cbindgen", "dep:which"]
 
+# cargo-c configuration:
+# skip header generation
+[package.metadata.capi.header]
+generation = false
+subdirectory = false
+# use the existing header for installation
+[package.metadata.capi.install.include]
+asset = [{ from="include/blazesym.h" }]
+
 [[bench]]
 name = "capi"
 path = "benches/capi.rs"