remove pointless initialization of qmakespec

we have proper fallback paths further down the line.

Change-Id: I3648cc985d21bbec4c2c24e179830db4467af210
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
(cherry picked from qtbase/0dedf8c3403923b963c51eb65d9cbe838d5ba0d4)
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/shared/proparser/qmakeglobals.cpp

@@ -103,7 +103,6 @@ QMakeGlobals::QMakeGlobals()
     dirlist_sep = QLatin1Char(':');
     dir_sep = QLatin1Char('/');
 #endif
-    qmakespec = getEnv(QLatin1String("QMAKESPEC"));
 }
 
 QMakeGlobals::~QMakeGlobals()