HPCC-23759 Update g++ required version to 7.3.0 or greater

Signed-off-by: Michael Gardner <michael.gardner@lexisnexisrisk.com>

cmake_modules/commonSetup.cmake

@@ -727,8 +727,8 @@ IF ("${COMMONSETUP_DONE}" STREQUAL "")
       ENDIF()
 
       IF (CMAKE_COMPILER_IS_GNUCXX)
-        IF ("${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "4.7.3")
-          MESSAGE(FATAL_ERROR "You need Gnu c++ version 4.7.3 or later to build this project (version ${CMAKE_CXX_COMPILER_VERSION} detected)")
+        IF ("${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "7.3.0")
+          MESSAGE(FATAL_ERROR "You need Gnu c++ version 7.3.0 or later to build this project (version ${CMAKE_CXX_COMPILER_VERSION} detected)")
         ENDIF()
       ENDIF()
     ENDIF()