message: Fix WebGL build.
diff: #include <utils/Panic.h>
  #include <filament/Texture.h>
  -
  using namespace utils;
  namespace filament {
  @@ -128,7 +127,7 @@ FTexture::FTexture(FEngine& engine, const Builder& builder) {
  mHandle = driver.createTexture(
  mTarget, mLevelCount, mFormat, mSampleCount, mWidth, mHeight, mDepth, mUsage);
  } else {
  - assert(mUsage & TextureUsage::SAMPLEABLE);
  + assert((bool)(mUsage & TextureUsage::SAMPLEABLE));
  mHandle = driver.importTexture(builder->mImportedId,
  mTarget, mLevelCount, mFormat, mSampleCount, mWidth, mHeight, mDepth, mUsage);
  }
  