[libc++] Use TARGET_FILE instead of TARGET_SONAME_FILE when generating ABI lists

TARGET_SONAME_FILE isn't valid on Windows, and TARGET_FILE should achieve
the same results.

Differential Revision: https://reviews.llvm.org/D92856

GitOrigin-RevId: f75bf712deecc1be157f7ba6e2fd80922942546c
1 file changed