Remove references to ZLIB and edit comment as appropriate. (#427)

Auxiliary/DirectXTexEXR.cpp

@@ -22,7 +22,7 @@
 #include <tuple>
 
 //
-// Requires the OpenEXR library <http://www.openexr.com/> and ZLIB <http://www.zlib.net>
+// Requires the OpenEXR library <http://www.openexr.com/> and its dependencies.
 //
 
 #ifdef __clang__

CMakeLists.txt

@@ -349,7 +349,6 @@ join_paths(DIRECTXTEX_LIBDIR_FOR_PKG_CONFIG "\${prefix}"     "${CMAKE_INSTALL_LI
 set(DIRECTXTEX_DEP_L "")
 if(ENABLE_OPENEXR_SUPPORT)
   list(APPEND DIRECTXTEX_DEP_L "OpenEXR")
-  list(APPEND DIRECTXTEX_DEP_L "zlib")
 endif()
 if(directxmath_FOUND)
   list(APPEND DIRECTXTEX_DEP_L "DirectXMath")