devel/objfw: Improve Makefile

• Sort options to pet portclippy.
• Rename option SSL to TLS: TLS used in PLIST_SUB and in name of the so library installed with this option - libobjfwtls.so.1.
• Add strip libobjfwtls.so.1 to TLS option MBEDTLS too.

PR: 280876
Approved by: Jonathan Schleifer <js@nil.im> (maintainer)