Use strtok_r instead of strtok

Use strtok_r instead of strtok

Improves threadsafety. This will be important when the patch series at
https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/176
lands.

gdb/ChangeLog:

2019-11-06  Christian Biesinger  <cbiesinger@google.com>

	* linux-tdep.c (linux_info_proc): Use strtok_r instead of strtok.
	* mi/mi-main.c (output_cores): Likewise.
	* nat/linux-osdata.c (linux_xfer_osdata_cpus): Likewise.
	(linux_xfer_osdata_modules): Likewise.
	* remote.c (register_remote_support_xml): Likewise.
	* sparc64-tdep.c (adi_is_addr_mapped): Likewise.
	* xml-syscall.c (syscall_create_syscall_desc): Likewise.

gdb/gdbserver/ChangeLog:

2019-11-06  Christian Biesinger  <cbiesinger@google.com>

	* linux-x86-low.c (x86_linux_process_qsupported): Use strtok_r
	instead of strtok.
	* server.c (handle_query): Likewise.
	(captured_main): Likewise.

Change-Id: Ief6138965a24398e5fc064598cd8f2abd3b5047c