bootstrap: check for git checkout correctly.

* gl/bulid-aux/bootstrap.in (func_require_git): Use .git instead
of .gitignore to recognise a git checkout.
* bootstrap: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
libtool: opt_duplicate_compiler_generated_deps is harmful on Solaris

Fix for http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16452.
* build-aux/ltmain.in (libtool_validate_options): disable the
opt_duplicate_compiler_generated_deps optimization for Solaris2 so
that gcc-4.9+ compiled C++ code with -Wl,-Bdirect on 64-bit Solaris
x86 can avoid unwinding failures caused by accidental mixing of the
libc and libgcc_s unwinders in a single executable.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>