disable building tests for hh-date on new enough GCC

On GCC 14.2, this won't build for me:

 include/libyang-cpp/Time.hpp:117:34: error: no matching function for call to ‘parse(const char [21], std::chrono::time_point<std::chrono::_V2::system_clock, std::chrono::duration<long int, std::ratio<1, 1000000000> > >&)’

The error message is actually the same as in a proposed fix [1], and
upstream maintainer has said that they actually recommend relying on the
STL on this "new enough" platform. I'm very happy to oblige.

We were discussing this last year
(I51242fe2ec873fba5954c44e38e898d205a9e484), but at the time this was
implemented the build failure was not known, AFAICT, so let's assume
that the former use case for building with "new enough STL", but
actually forcing HH-date, is no longer important.

[1] HowardHinnant/date#866

Change-Id: Id4b0206e2a960686fb1d8e76134b9061d7545d81

Author: jktjkt

CMakeLists.txt

@@ -129,11 +129,6 @@ if(BUILD_TESTING)
         add_executable(test_time-stl-hhdate tests/time.cpp)
         target_link_libraries(test_time-stl-hhdate DoctestIntegration yang-cpp date::date-tz)
         add_test(test_time-stl-hhdate test_time-stl-hhdate)
-
-        add_executable(test_time-hhdate tests/time.cpp)
-        target_link_libraries(test_time-hhdate DoctestIntegration yang-cpp date::date-tz)
-        target_compile_definitions(test_time-hhdate PUBLIC LIBYANG_CPP_SKIP_STD_CHRONO_TZ)
-        add_test(test_time-hhdate test_time-hhdate)
     endif()
 endif()
 

include/libyang-cpp/Time.hpp

@@ -10,7 +10,7 @@
 #include <chrono>
 #include "libyang-cpp/export.h"
 
-#if __cpp_lib_chrono >= 201907L && !LIBYANG_CPP_SKIP_STD_CHRONO_TZ
+#if __cpp_lib_chrono >= 201907L
 namespace libyang {
 namespace date_impl = std::chrono;
 }