Merge pull request #4872 from lhuang04/development_cmp0090

Update CMake version for CMP0090
diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf74af5..210aba4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -330,7 +330,7 @@
     DESTINATION "cmake"
     FILE "MbedTLSTargets.cmake")
 
-if(CMAKE_VERSION VERSION_GREATER 3.14)
+if(CMAKE_VERSION VERSION_GREATER 3.15 OR CMAKE_VERSION VERSION_EQUAL 3.15)
     # Do not export the package by default
     cmake_policy(SET CMP0090 NEW)