dev-libs/libpcre: import 8.12 version from main tree. R=cmasone@chromium.org BUG=none TEST=./build_packages --nousepkg on x86-generic/arm-generic Change-Id: I7625063fdd0785b27291a5428c26b2f3eb27bd88 Review URL: http://codereview.chromium.org/6793049