Use vendored dependencies in RHEL builds

The upstream release tarballs include the vendored dependencies.  In
Fedora builds, %goprep will remove them and still use dynamic
buildrequires, but RHEL does not package those and needs to use the
vendoring.

.gitignore

@@ -1,3 +1,4 @@
 /yggdrasil-ffb580f55ae91beff78156fdb6a41be8bc049117.tar.gz
 /yggdrasil-0.3.1.tar.gz
 /yggdrasil-0.3.2.tar.gz
+/yggdrasil-0.3.2.tar.xz

sources

@@ -1 +1 @@
-SHA512 (yggdrasil-0.3.2.tar.gz) = e438627e5e7becbf95c059ab9b633806ee64087dd9e97f5a5ff693621bdb49704f868139fda60b86cb8556fe206a1eee32103aeecd20da5839d40c257ba8872a
+SHA512 (yggdrasil-0.3.2.tar.xz) = adb94e48091a4df00e2de8bddd02cd0964cf1753be85bbdc3b16ed0aef6fb530718393f4868ed2323df70163e455a5bc34e1f33432c72026ba8d5588573cb2e3

yggdrasil.spec

@@ -21,7 +21,7 @@ Summary:        Remote data transmission and processing client
 
 License:        GPL-3.0-only
 URL:            %{gourl}
-Source:         %{gosource}
+Source:         %{url}/releases/download/%{version}/yggdrasil-%{version}.tar.xz
 
 BuildRequires:  systemd-rpm-macros
 BuildRequires:  meson
@@ -34,11 +34,13 @@ BuildRequires:  pkgconfig(bash-completion)
 %gopkg
 
 %prep
-%goprep
+%goprep %{?rhel:-k}
 %autopatch -p1
 
+%if %{undefined rhel}
 %generate_buildrequires
 %go_generate_buildrequires
+%endif
 
 %build
 %undefine _auto_set_build_flags
@@ -59,6 +61,9 @@ export %gomodulesmode
 
 %files
 %license LICENSE
+%if %{defined rhel}
+%license vendor/modules.txt
+%endif
 %doc CONTRIBUTING.md README.md
 %{_bindir}/*
 %config(noreplace) %{_sysconfdir}/%{name}