Remove trailing whitespaces

from bash (git-bash):
```
git grep -I --name-only -z -e '' -- . ':!tests/third_party' 
':!third_party' ':!tests/glbook' ':!system/lib/libc/musl' 
':!cmake/Modules/FindOpenAL.cmake' 
':!docs/emscripten_powered_by_logo.svg' ':!docs/paper.tex' 
':!media/powered_by_logo.svg' ':!media/switch_logo.svg' 
':!site/source/_themes' | xargs -0 sed -i 's/[ \t]\+\(\r\?\)$/\1/'
```

Author: aminya

ChangeLog.md

@@ -194,7 +194,7 @@ Current Trunk
   is encountered. This makes the Emscripten program behave more like a native
   program where the OS would terminate the process and no further code can be
   executed when an unhandled exception (e.g. out-of-bounds memory access) happens.
-  Once the program aborts any exported function calls will fail with a "program 
+  Once the program aborts any exported function calls will fail with a "program
   has already aborted" exception to prevent calls into code with a potentially
   corrupted program state.
 - Use `__indirect_function_table` as the import name for the table, which is

LICENSE

@@ -57,7 +57,7 @@ the following conditions:
     Neither the names of Mozilla,
     nor the names of its contributors may be used to endorse
     or promote products derived from this Software without specific prior
-    written permission. 
+    written permission.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF