Cleanup: fix typos in comments

Contributed by luzpaz.

Differential Revision: https://developer.blender.org/D7133

source/blender/datatoc/CMakeLists.txt

@@ -1,7 +1,7 @@
 # ***** BEGIN GPL LICENSE BLOCK *****
 #
 # This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public LicenseS
+# modify it under the terms of the GNU General Public Licenses
 # as published by the Free Software Foundation; either version 2
 # of the License, or (at your option) any later version.
 #
@@ -58,7 +58,7 @@ if(NOT WITH_HEADLESS)
 
   target_link_libraries(datatoc_icon ${PNG_LIBRARIES} ${ZLIB_LIBRARIES})
   # PNG library uses pow() and floow(), so seems -lm is required for proper
-  # workign binary.
+  # working binary.
   if(UNIX AND NOT APPLE)
     target_link_libraries(datatoc_icon m)
   endif()