Enable CET in cross compiler if possible

Don't perform CET run-time check for host when cross compiling.  Instead,
enable CET in cross compiler if possible so that it will run on both CET
and non-CET hosts.

config/

	PR bootstrap/94998
	* cet.m4 (GCC_CET_HOST_FLAGS): Enable CET in cross compiler if
	possible.

libiberty/

	PR bootstrap/94998
	* configure: Regenerated.

lto-plugin/

	PR bootstrap/94998
	* configure: Regenerated.

(cherry picked from commit d17cdc17c90ce77cb90c569322c1f241d3530cec)

config/cet.m4

@@ -111,6 +111,7 @@ if test x$may_have_cet = xyes; then
 fi
 
 if test x$may_have_cet = xyes; then
+  if test x$cross_compiling = xno; then
     AC_TRY_RUN([
 static void
 foo (void)
@@ -143,6 +144,11 @@ main ()
     if test x$enable_cet = xno -a x$have_cet = xyes; then
       AC_MSG_ERROR([Intel CET must be enabled on Intel CET enabled host])
     fi
+  fi
+else
+  # Enable CET in cross compiler if possible so that it will run on both
+  # CET and non-CET hosts.
+  have_cet=yes
 fi
 if test x$enable_cet = xyes; then
   $1="-fcf-protection"

libiberty/configure

@@ -5375,6 +5375,7 @@ rm -f core conftest.err conftest.$ac_objext \
 fi
 
 if test x$may_have_cet = xyes; then
+  if test x$cross_compiling = xno; then
     if test "$cross_compiling" = yes; then :
   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
@@ -5423,6 +5424,11 @@ fi
     if test x$enable_cet = xno -a x$have_cet = xyes; then
       as_fn_error $? "Intel CET must be enabled on Intel CET enabled host" "$LINENO" 5
     fi
+  fi
+else
+  # Enable CET in cross compiler if possible so that it will run on both
+  # CET and non-CET hosts.
+  have_cet=yes
 fi
 if test x$enable_cet = xyes; then
   CET_HOST_FLAGS="-fcf-protection"

lto-plugin/configure

@@ -5768,6 +5768,7 @@ rm -f core conftest.err conftest.$ac_objext \
 fi
 
 if test x$may_have_cet = xyes; then
+  if test x$cross_compiling = xno; then
     if test "$cross_compiling" = yes; then :
   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
 $as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
@@ -5816,6 +5817,11 @@ fi
     if test x$enable_cet = xno -a x$have_cet = xyes; then
       as_fn_error $? "Intel CET must be enabled on Intel CET enabled host" "$LINENO" 5
     fi
+  fi
+else
+  # Enable CET in cross compiler if possible so that it will run on both
+  # CET and non-CET hosts.
+  have_cet=yes
 fi
 if test x$enable_cet = xyes; then
   CET_HOST_FLAGS="-fcf-protection"
@@ -11941,7 +11947,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11944 "configure"
+#line 11950 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12047,7 +12053,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12050 "configure"
+#line 12056 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H