MDEV-36506 Build fails with cmake 4.0

Update cmake_minimum_required to 2.8...3.12 in root cmake and mroonga.

This will update "Policy Version" to 3.12, which will not prevent the
build by even higher cmake versions. There is also a reason to stay on
the compatible with windows "policy version", so 3.12 is conservatively
chosen.

On the other hand, it will require at least version 2.8.

CMakeLists.txt

@@ -14,7 +14,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1335 USA
 
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8...3.12)
 
 IF(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   # Setting build type to RelWithDebInfo as none was specified.

storage/mroonga/CMakeLists.txt

@@ -17,7 +17,7 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
 
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 2.8...3.12)
 project(mroonga)
 
 if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")

storage/mroonga/vendor/groonga/CMakeLists.txt

@@ -15,7 +15,7 @@
 
 # https://buildbot.askmonty.org/buildbot/builders/work-amd64-valgrind/builds/5263/steps/compile/logs/stdio
 # says CMake 2.6.2... We want to drop old software support...
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 2.8...3.12)
 # cmake_minimum_required(VERSION 2.6.4) # CentOS 5
 set(GRN_PROJECT_NAME "groonga")
 set(GRN_PROJECT_LABEL "Groonga")

storage/mroonga/vendor/groonga/vendor/plugins/groonga-normalizer-mysql/CMakeLists.txt

@@ -15,7 +15,7 @@
 # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 # MA 02110-1335  USA
 
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 2.8...3.12)
 if(NOT DEFINED GROONGA_NORMALIZER_MYSQL_PROJECT_NAME)
     set(GROONGA_NORMALIZER_MYSQL_PROJECT_NAME "groonga-normalizer-mysql")
 endif()