Restore V8_LIBC_UCLIBC as a libc option.

Restore V8_LIBC_UCLIBC as a libc option.

As uClibc defines __GLIBC__ in an attempt to look like glibc, V8_LIBC_GLIBC
was true for uClibc as well. Checking for uClibc before glibc fixes this
and restores the correct behavior.

BUG=

Committed: https://crrev.com/a684535693b4949e4863d0f60178ac3fc6638e82
Cr-Commit-Position: refs/heads/master@{#27806}

[smcgruer2, 2015-04-13 16:41:18]

smcgruer@google.com changed reviewers:
+ bmeurer@chromium.org

[smcgruer2, 2015-04-13 16:41:25]

https://codereview.chromium.org/1066573005/diff/1/include/v8config.h
File include/v8config.h (right):

https://codereview.chromium.org/1066573005/diff/1/include/v8config.h#newcode127
include/v8config.h:127: //  V8_LIBC_UCLIBC  - uClibc
I'm on the fence about reintroducing this, as it's not actually used anywhere in
the code. It's main purpose is to stop uClibc from pretending to be glibc, which
could also be done by changing the V8_LIBC_GLIBC check to:

#elif (defined(__GLIBC__) || defined(__GNU_LIBRARY__)) && !defined(__UCLIBC__)

[Benedikt Meurer, 2015-04-14 07:29:12]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-04-14 07:29:13]

lgtm

[commit-bot: I haz the power, 2015-04-14 07:29:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1066573005/1

[commit-bot: I haz the power, 2015-04-14 07:54:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-14 07:54:44]

Patchset 1 (id:??) landed as
https://crrev.com/a684535693b4949e4863d0f60178ac3fc6638e82
Cr-Commit-Position: refs/heads/master@{#27806}