package qt: don't attempt parallel make during configure (by Tony Theodore)

FreeBSD and OSX seem to have a problem with MAKEFLAGS being set. Tens
or hundreds of g++ processes are created and they eventually end up
with strange errors.

src/qt.mk

@@ -32,7 +32,6 @@ define $(PKG)_BUILD
         OPENSSL_LIBS="`'$(TARGET)-pkg-config' --libs-only-l openssl`" \
         PSQL_LIBS="-lpq -lsecur32 `'$(TARGET)-pkg-config' --libs-only-l openssl` -lws2_32" \
         SYBASE_LIBS="-lsybdb -liconv -lws2_32" \
-        MAKEFLAGS="-j '$(JOBS)'" \
         ./configure \
         -opensource \
         -confirm-license \