BaseTools: Add line number to PatchCheck error messages

PatchCheck error messages can be improved by adding the line number.
The line itself may consist of only whitespace for some errors.
Adding the line number can help better locate the error source.

Signed-off-by: Gary Beihl <garybeihl@microsoft.com>

BaseTools/Scripts/PatchCheck.py

@@ -485,7 +485,7 @@ class GitDiffCheck:
         lines = [ msg ]
         if self.filename is not None:
             lines.append('File: ' + self.filename)
-        lines.append('Line: ' + line)
+        lines.append('Line ' + str(self.line_num) + ': ' + line)
 
         self.error(*lines)
 
@@ -539,7 +539,7 @@ class GitDiffCheck:
     def format_error(self, err):
         self.format_ok = False
         err = 'Patch format error: ' + err
-        err2 = 'Line: ' + self.lines[self.line_num].rstrip()
+        err2 = 'Line ' + str(self.line_num) + ': ' + self.lines[self.line_num].rstrip()
         self.error(err, err2)
 
     def error(self, *err):