Update bindgen to 0.51

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

onig_sys-fix-metadata.diff

@@ -0,0 +1,11 @@
+--- onig_sys-69.2.0/Cargo.toml	1970-01-01T00:00:00+00:00
++++ onig_sys-69.2.0/Cargo.toml	2019-09-05T03:38:15.109145+00:00
+@@ -23,7 +23,7 @@
+ license = "MIT"
+ repository = "http://github.com/iwillspeak/rust-onig"
+ [build-dependencies.bindgen]
+-version = "0.50"
++version = "0.51"
+ 
+ [build-dependencies.cc]
+ version = "1.0"

rust-onig_sys.spec

@@ -13,8 +13,11 @@ Summary:        Raw rust bindings to the oniguruma library
 License:        MIT
 URL:            https://crates.io/crates/onig_sys
 Source:         %{crates_source}
+# Initial patched metadata
+# * Update bindgen to 0.51, https://github.com/rust-onig/rust-onig/pull/118
+Patch0:         onig_sys-fix-metadata.diff
 # Use system onig by default
-Patch0:         rust-onig_sys-use-system-onig.diff
+Patch1:         rust-onig_sys-use-system-onig.diff
 
 ExclusiveArch:  %{rust_arches}
 %if %{__cargo_skip_build}