give the pkg-config wrapper a proper name

amends 282f15feaa.

Change-Id: I91fa244a9c33495365da4278b99d6312c1af299a
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

mkspecs/features/qt_functions.prf

@@ -224,6 +224,7 @@ defineReplace(pkgConfigExecutable) {
         sysroot.value = $$PKG_CONFIG_SYSROOT_DIR
         libdir.name = PKG_CONFIG_LIBDIR
         libdir.value = $$PKG_CONFIG_LIBDIR
+        QT_TOOL_NAME = pkg-config
         qtAddToolEnv(PKG_CONFIG, sysroot libdir, SYS)
     }