Fix: bring back -O3 in LINK_FLAGS for 150kB smaller JS+WASM build

webgl/transcoder/CMakeLists.txt

diff --git a/webgl/transcoder/CMakeLists.txt b/webgl/transcoder/CMakeLists.txt
index 361dfb6..d40375f 100644
--- a/webgl/transcoder/CMakeLists.txt
+++ b/webgl/transcoder/CMakeLists.txt
@@ -64,5 +64,5 @@
   set_target_properties(basis_transcoder.js PROPERTIES
       OUTPUT_NAME "basis_transcoder"
       SUFFIX ".js"
-      LINK_FLAGS "--bind -s ALLOW_MEMORY_GROWTH=1 -s MALLOC=emmalloc -s MODULARIZE=1 -s EXPORT_NAME=BASIS -s ASSERTIONS=0 -s EXPORTED_RUNTIME_METHODS=['HEAP8']")
+      LINK_FLAGS "--bind -s ALLOW_MEMORY_GROWTH=1 -O3 -s MALLOC=emmalloc -s MODULARIZE=1 -s EXPORT_NAME=BASIS -s ASSERTIONS=0 -s EXPORTED_RUNTIME_METHODS=['HEAP8']")
 endif()