Update build-many-glibcs.py for binutils ia64 obsoletion.

Since binutils has obsoleted ia64 support, use --enable-obsolete for
now when configuring binutils for ia64 in build-many-glibcs.py (which
requires adding support for architecture-specific binutils configure
options there).  As with other obsoletions, the removal of support for
ia64 in any of (binutils, GCC, Linux kernel) should imply its removal
from glibc.

Tested with build-many-glibcs.py for ia64-linux-gnu (compilers and
glibcs build).

scripts/build-many-glibcs.py

@@ -212,7 +212,8 @@ class Context(object):
                         os_name='gnu')
         self.add_config(arch='ia64',
                         os_name='linux-gnu',
-                        first_gcc_cfg=['--with-system-libunwind'])
+                        first_gcc_cfg=['--with-system-libunwind'],
+                        binutils_cfg=['--enable-obsolete'])
         self.add_config(arch='m68k',
                         os_name='linux-gnu',
                         gcc_cfg=['--disable-multilib'])
@@ -1264,7 +1265,8 @@ class Config(object):
     """A configuration for building a compiler and associated libraries."""
 
     def __init__(self, ctx, arch, os_name, variant=None, gcc_cfg=None,
-                 first_gcc_cfg=None, glibcs=None, extra_glibcs=None):
+                 first_gcc_cfg=None, binutils_cfg=None, glibcs=None,
+                 extra_glibcs=None):
         """Initialize a Config object."""
         self.ctx = ctx
         self.arch = arch
@@ -1283,6 +1285,10 @@ class Config(object):
             self.first_gcc_cfg = []
         else:
             self.first_gcc_cfg = first_gcc_cfg
+        if binutils_cfg is None:
+            self.binutils_cfg = []
+        else:
+            self.binutils_cfg = binutils_cfg
         if glibcs is None:
             glibcs = [{'variant': variant}]
         if extra_glibcs is None:
@@ -1316,7 +1322,7 @@ class Config(object):
                                '--disable-gdbserver',
                                '--disable-libdecnumber',
                                '--disable-readline',
-                               '--disable-sim'])
+                               '--disable-sim'] + self.binutils_cfg)
         if self.os.startswith('linux'):
             install_linux_headers(LinuxHeadersPolicyForBuild(self), cmdlist)
         self.build_gcc(cmdlist, True)