Use libbpf-sys with vendored libbpf, as the system libbpf is too old

Signed-off-by: Michel Alexandre Salim <salimma@fedoraproject.org>

libbpf-rs-fix-metadata.diff

@@ -9,11 +9,3 @@
  
  [dependencies.thiserror]
  version = "1.0"
-@@ -61,6 +61,7 @@
- version = "0.5"
- 
- [features]
-+default = ["novendor"]
- novendor = ["libbpf-sys/novendor"]
- static = ["libbpf-sys/static"]
- [badges.maintenance]

rust-libbpf-rs.spec

@@ -13,7 +13,6 @@ License:        LGPL-2.1 OR BSD-2-Clause
 URL:            https://crates.io/crates/libbpf-rs
 Source:         %{crates_source}
 # Manually created patch for downstream crate metadata changes
-# - Turn on the novendor feature by default
 # - bump strum_macros dependency to 0.24
 Patch:          libbpf-rs-fix-metadata.diff