fdo#72598: odk: remove SunStudio support

No idea if the GCC stuff that's in there actually works.

Change-Id: Idd1b93edd88609f3c09d14134d00a15fa9c0b0b7
odk: "pltfrm" appears to be unused

Change-Id: Ia991593d53e31ad3d65881f9b6e62fede93e0266
fdo#72598: remove last uses of "C52"

Change-Id: Ibf43da89c88596589c8e81f790c9d57c2a4e9701