Fix ShXref to be case-sensitive, updating {Number} pattern

Author: idodeclare

src/org/opensolaris/opengrok/analysis/sh/ShXref.lex

@@ -33,7 +33,6 @@ import java.util.Stack;
 %class ShXref
 %extends JFlexXref
 %unicode
-%ignorecase
 %int
 %include CommonXref.lexh
 %{
@@ -109,7 +108,7 @@ import java.util.Stack;
 %}
 
 Identifier = [a-zA-Z_] [a-zA-Z0-9_]+
-Number = \$? [0-9]+\.[0-9]+|[0-9][0-9]*|"0x" [0-9a-fA-F]+
+Number = \$? [0-9]+\.[0-9]+| [0-9][0-9]* | [0][xX] [0-9a-fA-F]+
 
 File = {FNameChar}+ "." ([a-zA-Z]+)