Merge pull request #1913 from Binero/patch-1

Changed 'souces' to 'sources'.

CMakeLists.txt

@@ -311,7 +311,7 @@ IF ( NOT ASSIMP_BUILD_ZLIB )
 ENDIF( NOT ASSIMP_BUILD_ZLIB )
 
 IF( NOT ZLIB_FOUND )
-  MESSAGE(STATUS "compiling zlib from souces")
+  MESSAGE(STATUS "compiling zlib from sources")
   INCLUDE(CheckIncludeFile)
   INCLUDE(CheckTypeSize)
   INCLUDE(CheckFunctionExists)