build-many-glibcs: Remove no_isolate from SH config

Now with d40dbe72 SH build does not require more the no_isolate gcc
options to correct build glibc (since SH build now does not generate
a trap anymore).  This patch removes the unrequired options from
SH config.

Checked with a build for sh3-linux-gnu, sh3eb-linux-gnu, sh4-linux-gnu,
and sh4eb-linux-gnu.

	* scripts/build-many-glibcs.py (Context.add_all_configs): Remove
	no_isolate usage for SH.