Fix compilation with clang (#61)

Using `-std=c++2b` instead of `-std=c++23` allows compilation with clang instead of gcc.

CMakeLists.txt

@@ -36,7 +36,7 @@ execute_process(
 #
 
 include_directories(.)
-add_compile_options(-std=c++23 -DWLR_USE_UNSTABLE )
+add_compile_options(-std=c++2b -DWLR_USE_UNSTABLE )
 add_compile_options(-Wall -Wextra -Wno-unused-parameter -Wno-unused-value -Wno-missing-field-initializers -Wno-narrowing)
 find_package(Threads REQUIRED)
 
@@ -76,4 +76,4 @@ IF(CMAKE_BUILD_TYPE MATCHES Debug OR CMAKE_BUILD_TYPE MATCHES DEBUG)
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pg -no-pie -fno-builtin")
     SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pg -no-pie -fno-builtin")
     SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -pg -no-pie -fno-builtin")
-ENDIF(CMAKE_BUILD_TYPE MATCHES Debug OR CMAKE_BUILD_TYPE MATCHES DEBUG)
+ENDIF(CMAKE_BUILD_TYPE MATCHES Debug OR CMAKE_BUILD_TYPE MATCHES DEBUG)