Enable some features for RTEMS in libstdc++

Remove RTEMS support from crossconfig.m4 since this code is not used due to
"with_newlib" being "yes".

libstdc++-v3/ChangeLog:

	* configure: Regnerate.
	* configure.ac (newlib, *-rtems*): Enable TLS support for all RTEMS
	targets except bfin, lm32, mips, moxie, or1k, and v850.
	For all RTEMS targets, define HAVE_ALIGNED_ALLOC, HAVE_AT_QUICK_EXIT,
	HAVE_LINK, HAVE_POLL, HAVE_QUICK_EXIT, HAVE_READLINK, HAVE_SETENV,
	HAVE_SLEEP, HAVE_SOCKATMARK, HAVE_STRERROR_L, HAVE_SYMLINK,
	HAVE_TRUNCATE, and HAVE_USLEEP.
	* crossconfig.m4 (*-rtems*): Remove.

libstdc++-v3/configure.ac

@@ -353,6 +353,31 @@ else
 
     AC_DEFINE(HAVE_ICONV)
     AC_DEFINE(HAVE_MEMALIGN)
+
+    case "${target}" in
+      *-rtems*)
+        case "${target}" in
+          bfin* | lm32* | mips* | moxie* | or1k* | v850*)
+            ;;
+          *)
+            AC_DEFINE(HAVE_TLS)
+            ;;
+        esac
+        AC_DEFINE(HAVE_ALIGNED_ALLOC)
+        AC_DEFINE(HAVE_AT_QUICK_EXIT)
+        AC_DEFINE(HAVE_LINK)
+        AC_DEFINE(HAVE_POLL)
+        AC_DEFINE(HAVE_QUICK_EXIT)
+        AC_DEFINE(HAVE_READLINK)
+        AC_DEFINE(HAVE_SETENV)
+        AC_DEFINE(HAVE_SLEEP)
+        AC_DEFINE(HAVE_SOCKATMARK)
+        AC_DEFINE(HAVE_STRERROR_L)
+        AC_DEFINE(HAVE_SYMLINK)
+        AC_DEFINE(HAVE_TRUNCATE)
+        AC_DEFINE(HAVE_USLEEP)
+        ;;
+    esac
   elif test "x$with_headers" != "xno"; then
     GLIBCXX_CROSSCONFIG
   fi

libstdc++-v3/crossconfig.m4

@@ -244,12 +244,6 @@ case "${host}" in
     AC_DEFINE(HAVE_SINHF)
     AC_DEFINE(HAVE_SINHL)
     ;;
-  *-rtems*)
-    GLIBCXX_CHECK_COMPILER_FEATURES
-    GLIBCXX_CHECK_LINKER_FEATURES
-    GLIBCXX_CHECK_MATH_SUPPORT
-    GLIBCXX_CHECK_STDLIB_SUPPORT
-    ;;
   *-tpf)
     SECTION_FLAGS='-ffunction-sections -fdata-sections'
     SECTION_LDFLAGS='-Wl,--gc-sections $SECTION_LDFLAGS'