Update versions in build-many-glibcs.py.

This patch updates build-many-glibcs.py to use the current release
branch of binutils and current releases of GMP and the Linux kernel.

	* scripts/build-many-glibcs.py (Context.checkout): Default
	binutils version to 2.29 branch, GMP version to 6.1.2 and Linux
	kernel version to 4.12.

ChangeLog

@@ -1,3 +1,9 @@
+2017-07-04  Joseph Myers  <joseph@codesourcery.com>
+
+	* scripts/build-many-glibcs.py (Context.checkout): Default
+	binutils version to 2.29 branch, GMP version to 6.1.2 and Linux
+	kernel version to 4.12.
+
 2017-07-04  Florian Weimer  <fweimer@redhat.com>
 
 	* resolv/resolv_conf.c (struct resolv_conf_global): Clarify free

scripts/build-many-glibcs.py

@@ -682,11 +682,11 @@ def set_component_version(self, component, version, explicit, revision):
 
     def checkout(self, versions):
         """Check out the desired component versions."""
-        default_versions = {'binutils': 'vcs-2.28',
+        default_versions = {'binutils': 'vcs-2.29',
                             'gcc': 'vcs-7',
                             'glibc': 'vcs-mainline',
-                            'gmp': '6.1.1',
-                            'linux': '4.11',
+                            'gmp': '6.1.2',
+                            'linux': '4.12',
                             'mpc': '1.0.3',
                             'mpfr': '3.1.5'}
         use_versions = {}