kde-apps/marble: Fix build against >=dev-libs/protobuf-23.3

Bug: https://bugs.gentoo.org/909081
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

kde-apps/marble/files/marble-23.04.3-cxx17-for-protobuf-23.patch

@@ -0,0 +1,29 @@
+From dea7bb66fb0b89990c2ca69606d51f02af6c4cf1 Mon Sep 17 00:00:00 2001
+From: Albert Astals Cid <aacid@kde.org>
+Date: Tue, 11 Jul 2023 23:31:01 +0200
+Subject: [PATCH] Require C++17
+
+Newer protobuf will fail to compile without C++17
+---
+ CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c6d0e47ac0..b779501047 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -32,9 +32,9 @@ if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_C_COMPILER_ID}" STREQUAL
+     set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -std=iso9899:1990")
+ endif()
+ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
++    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
+ elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel" AND NOT WIN32)
+-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
++    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
+ endif()
+ # Default to hidden visibility for symbols
+ set(CMAKE_C_VISIBILITY_PRESET hidden)
+-- 
+GitLab
+

kde-apps/marble/marble-23.04.3.ebuild

@@ -64,6 +64,8 @@ BDEPEND="
 	aprs? ( dev-lang/perl )
 "
 
+PATCHES=( "${FILESDIR}/${P}-cxx17-for-protobuf-23.patch" ) # bug 909081, in 23.08.0
+
 src_prepare() {
 	ecm_src_prepare