[oe] 'LIBC' variable clashes with perl variable

[Tom Rini]

Tom Rini wrote:
> Koen Kooi wrote:
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>> Hi,
>>
>> Perl (among others) uses the 'LIBC' variable to point its linker to
>> libc.so.6, which fails due to OE redefing LIBC.
>>
>> Any objections to renaming LIBC to TARGET_LIBC in OE?
> 
> Sounds sane to me.

Actually, why don't we just unexport it, like MACHINE / DISTRO / 
TARGET_ARCH, and while we're at it, maybe TMPDIR too (since that's quite 
meaningful outside of OE).

-- 
Tom Rini
Mentor Graphics Corporation