remove stale code

with the removal of the skip jump label some time ago, this condition
became insatisfiable.

Change-Id: I4fc52ca8a38e048fd37c2ae6bfaae69acf09ada0
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

src/shared/proparser/qmakeparser.cpp

@@ -770,11 +770,6 @@ bool QMakeParser::read(ProFile *pro, const QString &in)
                 goto freshLine;
             }
 
-        if (!lineCont) {
-            cur = cptr;
-            ++m_lineNo;
-            goto freshLine;
-        }
         lineMarked = false;
       ignore:
         cur = cptr;