fix typo in comment of toolchain.prepare method

Author: lexming

easybuild/tools/toolchain/toolchain.py

@@ -861,7 +861,7 @@ def prepare(self, onlymod=None, deps=None, silent=False, loadmod=True,
             else:
                 self.log.debug("prepare: set additional variables onlymod=%s", onlymod)
 
-                # add linker and preprocessor paths to dependencies to self.vars
+                # add linker and preprocessor paths of dependencies to self.vars
                 self._add_dependency_variables()
                 self.generate_vars()
                 self._setenv_variables(onlymod, verbose=not silent)