virtual/perl-Time-Piece-1.310.0-r1: add alpha keyword

Gentoo-Bug: 604602
diff --git a/virtual/perl-Time-Piece/perl-Time-Piece-1.310.0-r1.ebuild b/virtual/perl-Time-Piece/perl-Time-Piece-1.310.0-r1.ebuild
index 16d8d0f..9d55584 100644
--- a/virtual/perl-Time-Piece/perl-Time-Piece-1.310.0-r1.ebuild
+++ b/virtual/perl-Time-Piece/perl-Time-Piece-1.310.0-r1.ebuild
@@ -5,7 +5,7 @@
 
 DESCRIPTION="Virtual for ${PN#perl-}"
 SLOT="0"
-KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ppc ppc64 ~sparc x86 ~x86-solaris"
+KEYWORDS="alpha amd64 arm arm64 hppa ~ia64 ppc ppc64 ~sparc x86 ~x86-solaris"
 
 RDEPEND="
 	|| ( =dev-lang/perl-5.24* ~perl-core/${PN#perl-}-${PV} )