[RFA] Assuming malloc exists in callfwmall.exp

[Michael Elizabeth Chastain]

Hi Jim,

> I think it's simply a property of HP's system --- perhaps a
> characteristic of the dynamic linker, perhaps something else --- that
> malloc is always available to the debugger, whether the program uses
> it or not.

As Kevin Buettner pointed out, it's the normal behavior on Red Hat Linux
natives.

It's also the normal behavior on Solaris native.  (Tested on Solaris 2.6
native with 2.9-gnupro-99r1 and with Sun's cc 4.2).

It's the normal behavior on i586-sco-sysv5uw7.1.1, as shown in test
results where callfwmall.exp passes all its tests.

Michael