okular: fix build with latest poppler-qt5

which needs c++17 now

print/okular/Makefile

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.139 2023/06/06 12:42:11 riastradh Exp $
+# $NetBSD: Makefile,v 1.140 2023/07/09 20:31:46 wiz Exp $
 
 DISTNAME=	okular-${KAPPSVER}
 PKGREVISION=	9
@@ -14,6 +14,8 @@ TOOL_DEPENDS+=	kdoctools>=5.19.0:../../devel/kdoctools
 
 USE_TOOLS+=	msgmerge pkg-config
 
+GCC_REQD+=	8 # std::optional
+
 # generation of kded.moc fails when ${PREFIX}/include in the moc include path
 SUBST_CLASSES+=		fix-moc
 SUBST_STAGE.fix-moc=	post-configure

print/okular/distinfo

@@ -1,5 +1,6 @@
-$NetBSD: distinfo,v 1.21 2022/09/29 01:10:58 markd Exp $
+$NetBSD: distinfo,v 1.22 2023/07/09 20:31:46 wiz Exp $
 
 BLAKE2s (okular-22.08.1.tar.xz) = 44487711f16fc0a0753f121a658dd53a48486a90021986f5e25768e57ce6f467
 SHA512 (okular-22.08.1.tar.xz) = 1fa3c8763d7432a21448c3715e69658609bf9cc50d767f74db89a37f0ef890dff97d276526aa6f41a0fcb91c36df39a1274d243785da74ce811448d896588d43
 Size (okular-22.08.1.tar.xz) = 8225648 bytes
+SHA1 (patch-CMakeLists.txt) = 02a25bb2a13adfc2530ff51558343d9bebd20f25

print/okular/patches/patch-CMakeLists.txt

@@ -0,0 +1,15 @@
+$NetBSD: patch-CMakeLists.txt,v 1.1 2023/07/09 20:31:46 wiz Exp $
+
+poppler-qt5 needs c++17 for std::optional.
+
+--- CMakeLists.txt.orig	2022-09-04 20:26:23.000000000 +0000
++++ CMakeLists.txt
+@@ -93,7 +93,7 @@ elseif(WIN32)
+     set(ENV{QT_PLUGIN_PATH} "$ENV{QT_PLUGIN_PATH};${KDE_INSTALL_FULL_QTPLUGINDIR}")
+ endif()
+ 
+-set(CMAKE_CXX_STANDARD 14)
++set(CMAKE_CXX_STANDARD 17)
+ set(CMAKE_CXX_STANDARD_REQUIRED ON)
+ set(CMAKE_CXX_EXTENSIONS OFF)
+