sim: configury: fix obsolete macros

sim: configury: fix obsolete macros

Running `autoreconf -vf -Wall' in the sim directory shows errors about the use
of obsolete macros.  This patch fix the issues with macros used or defined in
the sim directory.  However, it doesn't fix all warnings.  There's 1 autoconf
warning  from `config/pkg.m4', and many automake warnings about target
shadowing.  It cuts a lot of the noise down and makes an upgrade to
autoconf 2.71+ easier.

- Replace AC_CANONICAL_SYSTEM by AC_CANONICAL_TARGET
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Obsolete-Macros.html#index-AC_005fCANONICAL_005fSYSTEM-1997

- Replace AC_TRY_COMPILE by AC_COMPILE_IFELSE
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Obsolete-Macros.html#index-AC_005fTRY_005fCOMPILE-2203

- Replace AC_ERROR by AC_MSG_ERROR
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Obsolete-Macros.html#index-AC_005fERROR-2034

- Remove AC_TYPE_SIGNAL and replace `RETSIGTYPE' by `void' in the source
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Obsolete-Macros.html#index-AC_005fTYPE_005fSIGNAL-2213

- Remove AC_STRUCT_ST_BLKSIZE, it's already covered by a AC_CHECK_MEMBERS call
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Obsolete-Macros.html#index-AC_005fSTRUCT_005fST_005fBLKSIZE-2176

- Remove AC_STRUCT_ST_RDEV, it's already covered by a AC_CHECK_MEMBERS call
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Obsolete-Macros.html#index-AC_005fSTRUCT_005fST_005fRDEV-2180

- Remove AC_STRUCT_ST_BLOCKS.  It is not obsolete, but it's already covered by a
AC_CHECK_MEMBERS call.

- Replace deprecated C macros HAVE_ST_${MEMBER} by HAVE_STRUCT_STAT_ST_${MEMBER}
  https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/
Particular-Structures.html#index-AC_005fSTRUCT_005fST_005fBLOCKS-693

Approved-By: Tom Tromey <tom@tromey.com>