Remove use of find_dependency(Boost) since it causes problems with CMake versions before 3.9

Author: ras0219-msft

Release/cmake/cpprestsdk-config.in.cmake

@@ -7,11 +7,11 @@ if(@CPPREST_USES_OPENSSL@)
   find_dependency(OpenSSL)
 endif()
 
-if(@CPPREST_USES_BOOST@)
+if(@CPPREST_USES_BOOST@ AND OFF)
   if(UNIX)
     find_dependency(Boost COMPONENTS random system thread filesystem chrono atomic date_time regex)
   else()
     find_dependency(Boost COMPONENTS system date_time regex)
   endif()
 endif()
-include("${CMAKE_CURRENT_LIST_DIR}/cpprestsdk-targets.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/cpprestsdk-targets.cmake")