Fix rpm metadata issue between cmake and nativesdk-qtbase

Fix rpm metadata issue between cmake and nativesdk-qtbase

  file /opt/poky-agl/4.90.0+snapshot/sysroots/x86_64-aglsdk-linux/environment-setup.d conflicts between attempted installs of nativesdk-cmake-3.7.2-r0.x86_64_nativesdk and nativesdk-qtbase-tools-5.8.0+git0+49dc9aa409-r0.x86_64_nativesdk

Reference: https://stackoverflow.com/questions/45716949/during-sdk-build-environment-setup-d-conflicts-between-attempted-installs

Bug-AGL: SPEC-888

Change-Id: Iba6dd819cec44da26744a35eee31da968c9eb6ce
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>