[m-rev.] Upgrade Boehm GC to 7.6.0

[Julien Fischer]

Hi,

On Tue, 20 Sep 2016, Zoltan Somogyi wrote:

> On Tue, 20 Sep 2016 18:02:16 +1000 (AEST), Julien Fischer <jfischer at opturion.com> wrote:
>>> I've tested this with hlc.gc, hlc.par.gc, asm_fast.gc, asm_fast.par.gc.stseg
>>> on x86_64 Linux.  If anyone would like to test on other platforms that'd be
>>> good, but it's also okay to test this once its on master.
>>
>> Go and ahead and commit it to master.  I'll take a look at it on OS X
>> and Windows after you do that.
>
> I am afraid this broke my setup. I use Ubuntu 13.10, and it does
> NOT have libtool installed, which is why I get errors such as these
> (extracted from the output of make):

Paul, I thought you had removed the dependency on libtool; has it crept
back in somewhere?

Julien.