doc: drop redundant doxy variable

docs/CMakeLists.txt

@@ -2,7 +2,6 @@
 # Doxygen configuration (documentation)
 #
 
-set(DOXY_DEPS_DIRECTORY ${EnTT_SOURCE_DIR}/deps)
 set(DOXY_SOURCE_DIRECTORY ${EnTT_SOURCE_DIR}/src)
 set(DOXY_DOCS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
 set(DOXY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})

docs/doxy.in

@@ -967,7 +967,7 @@ RECURSIVE              = YES
 # Note that relative paths are relative to the directory from which doxygen is
 # run.
 
-EXCLUDE                = @DOXY_DEPS_DIRECTORY@
+EXCLUDE                =
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded