BaseTools/Scripts: Add sample makefile for use with RunMakefile.py

BaseTools/Scripts: Add sample makefile for use with RunMakefile.py

https://bugzilla.tianocore.org/show_bug.cgi?id=670

Add sample makefile that can be used to test RunMakefile.py
script and can also be used as a template to start a new
PREBUILD/POSTBUILD makefile.

This makefile contains TAB characters instead of spaces on
purpose to maximize compatibility with make utilities.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>