Revert "Revert "CMock can now compile without setjmp.h present on the platform""

This reverts commit 3eccb8e3d4.

docs/CMock_Summary.md

@@ -477,6 +477,13 @@ from the defaults. We've tried to specify what the defaults are below.
 
   * default: `['(?:__attribute__\s*\(+.*?\)+)']`
 
+* `:exclude_setjmp_h`:
+  Some embedded systems don't have <setjmp.h> available. Setting this to true
+  removes references to this header file and the ability to use cexception.
+
+  * default: false
+
+
 * `:subdir`:
   This is a relative subdirectory for your mocks.  Set this to e.g. "sys" in
   order to create a mock for `sys/types.h` in `(:mock_path)/sys/`.