Handling cr in binary lines.
Only trim cr before lf in binary chunks immediately before the boundary.
Removing spurious logging.
Defaulting max net server threads to CHIBI_NET_SERVER_MAX_THREADS
env var.  If set to 1, no separate threads are used.
Moving internal server error handler up a level and logging the error.
Adding binary upload utilities, allowing specifying headers in servlet-write.
Disabling SEXP_USE_SEND_FILE by default.
Binary-safe send-file.
Fixing SRFI 38 reading trailing #; comment after dotted tail.
Explicitly specify file modes on make install
Generate and install pkg-config file

Installing the .pc files for pkg-config helps other software to depend
on and build against chibi-scheme correctly.  See man pkg-config(1).