Refine the string to UINT* convert logic, not report error for this, just report warning. Also refine the logic, add the line info in the warning info.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2-buildtools/code/trunk/BaseTools@2669 c2973edb-eda0-4c78-bc6a-9341b269661f