[glslang] Strip trailing whitespace

There are many other files in the repo that have trailing whitespace
but this PR only cleans `glslang/SPIRV` and `glslang/Standalone`.

SPIRV/NonSemanticDebugPrintf.h

@@ -1,5 +1,5 @@
 // Copyright (c) 2020 The Khronos Group Inc.
-// 
+//
 // Permission is hereby granted, free of charge, to any person obtaining a
 // copy of this software and/or associated documentation files (the
 // "Materials"), to deal in the Materials without restriction, including
@@ -7,15 +7,15 @@
 // distribute, sublicense, and/or sell copies of the Materials, and to
 // permit persons to whom the Materials are furnished to do so, subject to
 // the following conditions:
-// 
+//
 // The above copyright notice and this permission notice shall be included
 // in all copies or substantial portions of the Materials.
-// 
+//
 // MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
 // KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
 // SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
 //    https://www.khronos.org/registry/
-// 
+//
 // THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
@@ -23,7 +23,7 @@
 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 // MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
-// 
+//
 
 #ifndef SPIRV_UNIFIED1_NonSemanticDebugPrintf_H_
 #define SPIRV_UNIFIED1_NonSemanticDebugPrintf_H_