sci-libs/silo: fix build with minimal QT

Closes: https://bugs.gentoo.org/831361
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

sci-libs/silo/files/silo-4.11-widgets.patch

@@ -0,0 +1,11 @@
+On a minimal QT installation, widgets may not necessarily be
+added and it needs to be explicitely done. Modifying ./configure
+directly given tarball lacks some files to run eautoreconf.
+
+https://bugs.gentoo.org/831361
+--- a/configure
++++ b/configure
+@@ -25748,2 +25748,3 @@
+ qtHaveModule(testlib):           QT += testlib
++qtHaveModule(widgets):           QT += widgets
+ percent.target = %

sci-libs/silo/silo-4.11-r1.ebuild

@@ -31,6 +31,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-test-disable-largefile.patch
 	"${FILESDIR}"/${P}-tests.patch
 	"${FILESDIR}"/${P}-testsuite-python-write.patch
+	"${FILESDIR}"/${P}-widgets.patch
 )
 
 src_configure() {