Remove nonsensical initialization from QMakeLocalFileName

The c'tor that takes a QString detects whether the string's first and
*last but one* characters are double quotes. In that case it removes
the first and *last* characters, resulting in a conversion from
"\"C:\\foo\"\\" to "C:\\foo\"". It's highly unlikely that this code path
was ever triggered, because its erroneous result would have been
noticed. Remove it.

Change-Id: I653e6a4667ae3620c35e509420eb22a71bb986a9
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

qmake/generators/makefiledeps.cpp

@@ -61,13 +61,8 @@ inline bool qmake_endOfLine(const char &c) { return (c == '\r' || c == '\n'); }
 #endif
 
 QMakeLocalFileName::QMakeLocalFileName(const QString &name) : is_null(name.isNull())
+                                                            , real_name(name)
 {
-    if(!name.isEmpty()) {
-        if(name.at(0) == QLatin1Char('"') && name.at(name.length()-2) == QLatin1Char('"'))
-            real_name = name.mid(1, name.length()-2);
-        else
-            real_name = name;
-    }
 }
 const QString
 &QMakeLocalFileName::local() const