Correct Boost version variable for dependencies (#34)

In CMake < 3.15, the Boost_VERSION variable stored the raw version
string from the Boost header. This is incorrect for dependencies, and
this is a less intrusive fix than updating the CMake requirement

CMakeLists.txt

@@ -173,7 +173,7 @@ if( BUILD_CLIENTS_RIDER OR BUILD_CLIENTS_SAMPLES OR BUILD_CLIENTS_TESTS )
   if(BUILD_CLIENTS_TESTS OR BUILD_CLIENTS_RIDER)
     find_package( Boost COMPONENTS program_options REQUIRED)
     set(BOOST_DEB "libboost-program-options${Boost_VERSION_MAJOR}.${Boost_VERSION_MINOR}.${Boost_VERSION_PATCH}")
-    set(BOOST_RPM "boost-devel = ${Boost_VERSION}")
+    set(BOOST_RPM "boost-devel = ${Boost_VERSION_MAJOR}.${Boost_VERSION_MINOR}.${Boost_VERSION_PATCH}")
   endif()
   if(NOT CLIENTS_OS)
     rocm_set_os_id(CLIENTS_OS)