[build] Use -Wno-deprecated-declarations

Don't let the public va*.h headers induce warnings when
the macros detect compiler support for it.

Change-Id: I37888241babe04cc0bb4a964f09c7dafa6d65677
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/github.com/intel/libva/+/1722970
Reviewed-by: Petr Hosek <phosek@google.com>

fuchsia/BUILD.gn

diff --git a/fuchsia/BUILD.gn b/fuchsia/BUILD.gn
index b5c2b4d..3cfd87d 100644
--- a/fuchsia/BUILD.gn
+++ b/fuchsia/BUILD.gn
@@ -21,11 +21,13 @@
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 copy("copy_magma") {
+  visibility = [ ":*" ]
   sources = [ "../va/magma/va_magma.h" ]
   outputs = [ "$target_gen_dir/headers/va/va_magma.h" ]
 }
 
 action("gen_version") {
+  visibility = [ ":*" ]
   script = "gen_version.sh"
   sources = [
     "../build/gen_version.sh",
@@ -41,7 +43,8 @@
   ]
 }
 
-config("headers_config") {
+config("headers.config") {
+  visibility = [ ":*" ]
   include_dirs = [
     "$target_gen_dir/headers",
     "..",
@@ -53,5 +56,10 @@
     ":copy_magma",
     ":gen_version",
   ]
-  public_configs = [ ":headers_config" ]
+  public_configs = [
+    ":headers.config",
+
+    # Don't warn about `va_deprecated` declarations in the public headers.
+    "//build/config:Wno-deprecated-declarations",
+  ]
 }