x11-toolkits/qt5-declarative: fix testlib-build-failures

Since Qt5 testlib tries to be a build-dependency only when
needed, and since we build the QML bits without installing
the corresponding test-tools, declarative had the following
problem:
- without testlib installed, would build fine
- with testlib installed, would assume the QML test bits
  are available, and then fail in the build.

This is basically our split-up-packaging without subpackages
shooting us in the foot; fix the build by removing one more
place where testlib leads to the building-of-tests. (The existing
patch files/patch-src_src.pro does something similar)

PR:		257102 260433
Reported by:	Frank Reisert, Philipp Ost

x11-toolkits/qt5-declarative/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	declarative
 DISTVERSION=	${QT5_VERSION}
-PORTREVISION=	4
+PORTREVISION=	5
 CATEGORIES=	x11-toolkits
 PKGNAMEPREFIX=	qt5-
 

x11-toolkits/qt5-declarative/files/patch-src_imports_imports.pro

@@ -0,0 +1,10 @@
+--- src/imports/imports.pro.orig	2021-12-17 11:51:57 UTC
++++ src/imports/imports.pro
+@@ -24,7 +24,6 @@ qtHaveModule(quick) {
+ 
+     qtConfig(quick-shadereffect): SUBDIRS += wavefrontmesh
+ 
+-    qtHaveModule(testlib): SUBDIRS += testlib
+     qtConfig(systemsemaphore): SUBDIRS += sharedimage
+     qtConfig(quick-particles): \
+         SUBDIRS += particles