dev-python/pyblake2: keyword ~x64-cygwin

Passes src_test for py27.

Bug: https://bugs.gentoo.org/634936
Package-Manager: Portage-2.3.13, Repoman-2.3.3

dev-python/pyblake2/pyblake2-1.1.0.ebuild

@@ -13,7 +13,7 @@ SRC_URI="mirror://pypi/${PN::1}/${PN}/${P}.tar.gz"
 # pyblake2 itself allows more licenses but blake2 allows the following three
 LICENSE="|| ( CC0-1.0 openssl Apache-2.0 )"
 SLOT="0"
-KEYWORDS="~alpha amd64 ~arm hppa ia64 ~mips ppc ppc64 ~sparc ~x86 ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+KEYWORDS="~alpha amd64 ~arm hppa ia64 ~mips ppc ppc64 ~sparc ~x86 ~x64-cygwin ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
 
 python_test() {
 	"${EPYTHON}" test/test.py || die "Tests fail with ${EPYTHON}"