closes https://github.com/assimp/assimp/issues/2075: Make inject of debug postfix an option, so you can swich it off.

CMakeLists.txt

@@ -105,6 +105,10 @@ OPTION ( BUILD_DOCS
   "Build documentation using Doxygen."
   OFF
 )
+OPTION( INJECT_DEBUG_POSTFIX
+  "Inject debug postfix in .a/.so lib names"
+  ON
+)
 
 IF (IOS)
 	IF (NOT CMAKE_BUILD_TYPE)