libmozjpeg is no longer a shared library, so no need to have it in the embedding manifest. not part of the normal build.

embedding/config/basebrowser-mac-macho

@@ -128,7 +128,6 @@ components/necko_res.xpt
 components/necko_strconv.xpt            
 
 ; imagelib
-libmozjpeg.dylib
 components/libimglib2.dylib
 components/imglib2.xpt
 

embedding/config/basebrowser-unix

@@ -65,7 +65,6 @@ components/layout_xul.xpt
 components/content_base.xpt
 
 ; Imaging:
-libmozjpeg.so
 libmozz.so
 components/libimglib2.so
 components/imglib2.xpt