add a macro that really identifies glibc

uClibc pretends to be glibc, so just checking for __GLIBC__ doesn't always
work.  Rather than check for defined(__GLIBC__) && !defined(__UCLIBC__) in
multiple places, do it once and define LIBC_GLIBC if we're certain that we're
really using glibc.

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/15405003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201761 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 292633f04eedef53b2d77cb6dde6a019a3415dbb
2 files changed
tree: 1e2132fec569d2ce984182115fba260ea2211979
  1. base/
  2. build/
  3. dbus/
  4. ipc/
  5. testing/
  6. third_party/