qtermwidget-devel: update, fix handling of GitHub tarballs

and try to fix build on older systems

devel/qtermwidget-devel/Portfile

@@ -4,17 +4,15 @@ PortSystem          1.0
 PortGroup           cmake 1.1
 PortGroup           github 1.0
 PortGroup           qt5 1.0
+PortGroup           cxx11 1.1
 
-github.setup        lxde qtermwidget 8f1b40b55f34202cf80764cf1d56a185c9dad389
+github.setup        lxqt qtermwidget b87de8976774dcbd2919d3ddf63feee39db9e373
 name                qtermwidget-devel
-version             20190406
+version             20190413
 
-# github port group uses /tarball/, which results in unpredictable directory name in the source tarball
-master_sites        https://github.com/lxqt/qtermwidget/archive/${git.branch}
-
-checksums           rmd160  82f42096e42f672733e9bc5399e7d8695efd5ca6 \
-                    sha256  dfc1250bff570785d5db11254767ab3e532a5975c0726760555c4982a77bc300 \
-                    size    224198
+checksums           rmd160  5665de5721a112ac34346bce4bfc7b750a7b605d \
+                    sha256  d7c3eb5e0835f8614b3673611d8f99b2a613699b7ee6cb2481658f9149d79a79 \
+                    size    224335
 
 categories          devel
 maintainers         {yan12125 @yan12125} openmaintainer