Downgrade libbpf-sys to 0.4.0-2 on Fedora 35 and earlier

libbpf-cargo-downgrade-libbpf-sys.patch

@@ -0,0 +1,12 @@
+diff -Naur a/Cargo.toml b/Cargo.toml
+--- a/Cargo.toml	2021-10-25 10:12:51.321033877 -0700
++++ b/Cargo.toml	2021-10-25 10:14:01.983431692 -0700
+@@ -35,7 +35,7 @@
+ version = "0.12"
+ 
+ [dependencies.libbpf-sys]
+-version = "0.5.0-1"
++version = "0.4.0-2"
+ 
+ [dependencies.memmap2]
+ version = "0.3"

rust-libbpf-cargo.spec

@@ -14,6 +14,9 @@ URL:            https://crates.io/crates/libbpf-cargo
 Source:         %{crates_source}
 # Turn on the novendor feature by default
 Patch0:         libbpf-cargo-fix-metadata.diff
+# Downgrade libbpf-sys to 0.4.0-2; this patch is meant for Fedora 35 and lower
+# where libbpf is still at 0.4.0
+Patch1:         libbpf-cargo-downgrade-libbpf-sys.patch
 
 ExclusiveArch:  %{rust_arches}
 %if %{__cargo_skip_build}
@@ -84,7 +87,11 @@ which use "novendor" feature of "%{crate}" crate.
 %ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
 
 %prep
-%autosetup -n %{crate}-%{version_no_tilde} -p1
+%setup -q -n %{crate}-%{version_no_tilde}
+%patch0 -p1
+%if 0%{?fedora} < 36
+%patch1 -p1
+%endif
 %cargo_prep
 
 %generate_buildrequires