File c++17.patch of Package openscad

Index: openscad-2021.01/CMakeLists.txt
===================================================================
--- openscad-2021.01.orig/CMakeLists.txt
+++ openscad-2021.01/CMakeLists.txt
@@ -68,7 +68,7 @@ file(MAKE_DIRECTORY ${AUTOGEN_BUILD_DIR}
 
 add_compile_options("$<$<CONFIG:DEBUG>:-DDEBUG>")
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 add_definitions(-D_REENTRANT -DUNICODE -D_UNICODE)
 # Stack size 8MB; github issue 116
 add_definitions(-DSTACKSIZE=8388608)
Index: openscad-2021.01/c++std.pri
===================================================================
--- openscad-2021.01.orig/c++std.pri
+++ openscad-2021.01/c++std.pri
@@ -26,8 +26,8 @@ macx {
 }
 
 c++std {
-  CONFIG += c++14 strict_c++
-  message("Using C++14")
+  CONFIG += c++17 strict_c++
+  message("Using C++17")
 
   *clang*: {
       # 3rd party libraries will probably violate this for a long time