[feature/OFFICIALLY UNSUPPORTED] add nowasm build tag to disable building with WebAssembly (#3429)

* add experimental build-tag 'nowasm' which uses local ffmpeg / ffprobe

* updated experimental support message

* add comment to build script explaining build tag

* add nowasm build tags to moderncsqlite files

internal/media/ffmpeg/wasm.go

@@ -15,6 +15,8 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !nowasm
+
 package ffmpeg
 
 import (
@@ -41,12 +43,6 @@ var (
 	ffprobe wazero.CompiledModule
 )
 
-// Args encapsulates the passing of common
-// configuration options to run an instance
-// of a compiled WebAssembly module that is
-// run in a typical CLI manner.
-type Args = wasm.Args
-
 // compileFfmpeg ensures the ffmpeg WebAssembly has been
 // pre-compiled into memory. If already compiled is a no-op.
 func compileFfmpeg(ctx context.Context) error {