[binutils-gdb] Fix build with GCC 8: strncpy -> memcpy

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 29f9a5673764c1b2711c0ceeba380a6ee764d1b2 ***

Author: Yao Qi <yao.qi@linaro.org>
Branch: master
Commit: 29f9a5673764c1b2711c0ceeba380a6ee764d1b2

Fix build with GCC 8: strncpy -> memcpy

Recent gcc 8 trunk emits the warning below,

../../../binutils-gdb/gdb/gdbserver/remote-utils.c:1204:14: error: char* strncpy(char*, const char*, size_t) output truncated before terminating nul copying 6 bytes from a string of the same length [-Werror=stringop-truncation]
      strncpy (buf, "watch:", 6);
      ~~~~~~~~^~~~~~~~~~~~~~~~~~

../../binutils-gdb/gdb/cli/cli-decode.c:1118:15: error: char* strncpy(char*, const char*, size_t) specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
       strncpy (cmdtype1 + 1, cmdtype, len - 1);
       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../binutils-gdb/gdb/cli/cli-decode.c:1110:16: note: length computed here
   len = strlen (cmdtype);
         ~~~~~~~^~~~~~~~~
../../binutils-gdb/gdb/cli/cli-decode.c:1120:15: error: char* strncpy(char*, const char*, size_t) specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
       strncpy (cmdtype2, cmdtype, len - 1);
       ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../binutils-gdb/gdb/cli/cli-decode.c:1110:16: note: length computed here
   len = strlen (cmdtype);
         ~~~~~~~^~~~~~~~~

../../binutils-gdb/gdb/cp-namespace.c:1071:11: error: char* strncpy(char*, const char*, size_t) output truncated before terminating nul copying 2 bytes from a string of the same length [-Werror=stringop-truncation]
   strncpy (full_name + scope_length, "::", 2);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This patch fixes it by using memcpy instead of strncpy.

gdb:

2017-11-22  Yao Qi  <yao.qi@linaro.org>

	* cli/cli-decode.c (help_list): Use memcpy instead of strncpy.
	* cp-namespace.c (cp_lookup_transparent_type_loop): Likewise.

gdb/gdbserver:

2017-11-22  Yao Qi  <yao.qi@linaro.org>

	* remote-utils.c (prepare_resume_reply): Use memcpy.