MIPS: Set the required Linux kernel version to 4.5.0 for 2008 NaN

Complement the addition of the required kernel support, present upstream
as from commit 2b5e869ecfcb3112f7e1267cb0328f3ff6d49b18 ("MIPS: ELF:
Interpret the NAN2008 file header flag") and released with Linux 4.5-rc1
on Jan 24th, 2016.

	* sysdeps/unix/sysv/linux/mips/configure.ac: Set
	`arch_minimum_kernel' to 4.5.0 if 2008 NaN encoding is used.
	* sysdeps/unix/sysv/linux/mips/configure: Regenerate.

ChangeLog

@@ -1,3 +1,9 @@
+2016-01-25  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* sysdeps/unix/sysv/linux/mips/configure.ac: Set
+	`arch_minimum_kernel' to 4.5.0 if 2008 NaN encoding is used.
+	* sysdeps/unix/sysv/linux/mips/configure: Regenerate.
+
 2016-01-22  Paul E. Murphy  <murphyp@linux.vnet.ibm.com>
 
 	* nptl/tst-setuid3.c (is_invalid_barrier_ret): New function.

sysdeps/unix/sysv/linux/mips/configure

@@ -472,9 +472,6 @@ libc_cv_gcc_unwind_find_fde=yes
 
 if test -z "$arch_minimum_kernel"; then
   if test x$libc_cv_mips_nan2008 = xyes; then
-    # FIXME: Adjust this setting to the actual first upstream kernel
-    # version to support the 2008 NaN encoding and then remove this
-    # comment.
-    arch_minimum_kernel=10.0.0
+    arch_minimum_kernel=4.5.0
   fi
 fi

sysdeps/unix/sysv/linux/mips/configure.ac

@@ -131,9 +131,6 @@ libc_cv_gcc_unwind_find_fde=yes
 
 if test -z "$arch_minimum_kernel"; then
   if test x$libc_cv_mips_nan2008 = xyes; then
-    # FIXME: Adjust this setting to the actual first upstream kernel
-    # version to support the 2008 NaN encoding and then remove this
-    # comment.
-    arch_minimum_kernel=10.0.0
+    arch_minimum_kernel=4.5.0
   fi
 fi