Recent Commits to s3fs-fuse:master

Remove S3FS_MALLOC_TRIM (#2699)

42b74c9d2ed67da4cf1f6586d179b1d3c34fcb10 introduced this flag but it
is not clear that this behavior is required with recent libxml2
version.

Convert #if defined to #ifdef where possible (#2698)

Suggested by clang-tidy.