[Wayland] Add FreeBSD platform (#7381)

W/Wayland/build_tarballs.jl

@@ -15,8 +15,8 @@ sources = [
 script = raw"""
 cd $WORKSPACE/srcdir/wayland-*/
 
-# We need to run `wayland-scanner` of the same version on the host system
-apk add wayland-dev --repository=http://dl-cdn.alpinelinux.org/alpine/v3.17/main
+ln -s `which wayland-scanner` $bindir
+cp $prefix/libdata/pkgconfig/* $prefix/lib/pkgconfig || true
 
 mkdir build-wayland
 
@@ -26,11 +26,12 @@ meson .. \
     -Ddocumentation=false
 ninja -j${nproc}
 ninja install
+rm -f $prefix/lib/pkgconfig/epoll-shim*.pc
 """
 
 # These are the platforms we will build for by default, unless further
 # platforms are passed in on the command line
-platforms = filter!(Sys.islinux, supported_platforms(; experimental=true))
+platforms = filter(p -> arch(p) != "armv6l" && (Sys.islinux(p) || Sys.isfreebsd(p)), supported_platforms())
 
 # The products that we will ensure are always built
 products = [
@@ -46,6 +47,8 @@ dependencies = [
     Dependency("Expat_jll"; compat="2.2.10"),
     Dependency("Libffi_jll"; compat="~3.2.2"),
     Dependency("XML2_jll"),
+    Dependency("EpollShim_jll"),
+    HostBuildDependency("Wayland_jll"),
 ]
 
 # Build the tarballs.