Enable php extensions for build and runtime separately

[zd-dalibor]

I notice that openssl extension is not enabled in runtime image.
I fallow the documentation and use .php.ini.d to enable extension explicitly.
Now, my application works fine, but I notice some warning messages during build process:

Paketo Buildpack for Composer Install 0.3.28
  Running 'composer check-platform-reqs'
      PHP Warning:  Module "openssl" is already loaded in Unknown on line 0
      PHP Warning:  Module "openssl" is already loaded in Unknown on line 0

It seems that openssl extension is already enabled during build phase.

Describe the Enhancement

Do we have an option to enable different set of php extensions for build and runtime?