* print.c (_stp_print_flush): Rewrite so one version works for
relayfs or procfs. Use proper per-cpu functions.
(_stp_reserve_bytes): New function. Reserve bytes in the output buffer.
(_stp_print_binary): New function. Write a variable number of
64-bit values directly into the output buffer.
* string.c (_stp_sprintf): Rewrite using new per-cpu buffers.
(_stp_vsprintf): Ditto.
(_stp_string_cat_cstr): Ditto.
(_stp_string_cat_char): Ditto.
* runtime.h: Set defaults for MAXTRYLOCK and TRYLOCKDELAY to make
runtime tests in bench2 happy.