sim: clean up C11 header includes

Since we require C11 now, we can assume many headers exist, and
clean up all of the conditional includes.  It's not like any of
this code actually accounted for the headers not existing, just
whether we could include them.

The strings.h cleanup is a little nuanced: it isn't in C11, but
every use of it in the codebase will include strings.h only if
string.h doesn't exist.  Since we now assume the C11 string.h
exists, we'll never include strings.h, so we can delete it.

sim/bpf/ChangeLog

@@ -1,3 +1,7 @@
+2021-01-11  Mike Frysinger  <vapier@gentoo.org>
+
+	* config.in, configure: Regenerate.
+
 2021-01-09  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure: Regenerate.

sim/bpf/config.in

@@ -13,9 +13,6 @@
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
-/* Define to 1 if you have the <errno.h> header file. */
-#undef HAVE_ERRNO_H
-
 /* Define to 1 if you have the <fcntl.h> header file. */
 #undef HAVE_FCNTL_H
 
@@ -130,9 +127,6 @@
 /* Define to 1 if you have the `time' function. */
 #undef HAVE_TIME
 
-/* Define to 1 if you have the <time.h> header file. */
-#undef HAVE_TIME_H
-
 /* Define to 1 if you have the `truncate' function. */
 #undef HAVE_TRUNCATE
 

sim/bpf/configure

@@ -6802,6 +6802,19 @@ test -z "$deplibs_check_method" && deplibs_check_method=unknown
 
 
 
+plugin_option=
+plugin_names="liblto_plugin.so liblto_plugin-0.dll cyglto_plugin-0.dll"
+for plugin in $plugin_names; do
+  plugin_so=`${CC} ${CFLAGS} --print-prog-name $plugin`
+  if test x$plugin_so = x$plugin; then
+    plugin_so=`${CC} ${CFLAGS} --print-file-name $plugin`
+  fi
+  if test x$plugin_so != x$plugin; then
+    plugin_option="--plugin $plugin_so"
+    break
+  fi
+done
+
 if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}ar", so it can be a program name with args.
 set dummy ${ac_tool_prefix}ar; ac_word=$2
@@ -6895,6 +6908,11 @@ else
 fi
 
 test -z "$AR" && AR=ar
+if test -n "$plugin_option"; then
+  if $AR --help 2>&1 | grep -q "\--plugin"; then
+    AR="$AR $plugin_option"
+  fi
+fi
 test -z "$AR_FLAGS" && AR_FLAGS=cru
 
 
@@ -7099,6 +7117,11 @@ else
 fi
 
 test -z "$RANLIB" && RANLIB=:
+if test -n "$plugin_option" && test "$RANLIB" != ":"; then
+  if $RANLIB --help 2>&1 | grep -q "\--plugin"; then
+    RANLIB="$RANLIB $plugin_option"
+  fi
+fi
 
 
 
@@ -8935,15 +8958,13 @@ $as_echo "$LINGUAS" >&6; }
 fi
 
 # Check for common headers.
-# FIXME: Seems to me this can cause problems for i386-windows hosts.
-# At one point there were hardcoded AC_DEFINE's if ${host} = i386-*-windows*.
-for ac_header in stdlib.h string.h strings.h unistd.h time.h
+# NB: You can assume C11 headers exist.
+for ac_header in unistd.h
 do :
-  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
-ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
-if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  ac_fn_c_check_header_mongrel "$LINENO" "unistd.h" "ac_cv_header_unistd_h" "$ac_includes_default"
+if test "x$ac_cv_header_unistd_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+#define HAVE_UNISTD_H 1
 _ACEOF
 
 fi
@@ -8976,7 +8997,7 @@ fi
 
 done
 
-for ac_header in dlfcn.h errno.h sys/stat.h
+for ac_header in dlfcn.h sys/stat.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
@@ -12913,7 +12934,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12916 "configure"
+#line 12937 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -13019,7 +13040,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 13022 "configure"
+#line 13043 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H