- Fix the python version to one used by the port.

--- CMakeLists.txt.orig	2023-04-09 15:01:42 UTC
+++ CMakeLists.txt
@@ -137,7 +137,7 @@ if(${pagmo_VERSION} VERSION_LESS ${_PYGMO_MIN_PAGMO_VE
 endif()
 
 # python.
-find_package(Python3 REQUIRED COMPONENTS Interpreter Development.Module)
+find_package(Python3 ${FREEBSD_PYTHON_DISTVERSION} EXACT REQUIRED COMPONENTS Interpreter Development.Module)
 message(STATUS "Python3 interpreter: ${Python3_EXECUTABLE}")
 message(STATUS "Python3 installation directory: ${Python3_SITEARCH}")
 set(PYGMO_INSTALL_PATH "" CACHE STRING "pygmo module installation path")