dev-lang/python: Move readline dep outside 'ncurses?'

Move the dependency on readline to be independent of ncurses.  Looking
at the code, there is no apparent reason for putting it inside
'ncurses?' block.  Furthermore, it is inconsistent with how the readline
module build is controlled.

Closes: https://bugs.gentoo.org/401651

dev-lang/python/python-2.7.14-r1.ebuild

@@ -42,10 +42,8 @@ RDEPEND="app-arch/bzip2:0=
 		sys-libs/db:4.2
 	) )
 	gdbm? ( sys-libs/gdbm:0=[berkdb] )
-	ncurses? (
-		>=sys-libs/ncurses-5.2:0=
-		readline? ( >=sys-libs/readline-4.1:0= )
-	)
+	ncurses? ( >=sys-libs/ncurses-5.2:0= )
+	readline? ( >=sys-libs/readline-4.1:0= )
 	sqlite? ( >=dev-db/sqlite-3.3.8:3= )
 	ssl? (
 		!libressl? ( dev-libs/openssl:0= )

dev-lang/python/python-3.4.6-r1.ebuild

@@ -30,10 +30,8 @@ RDEPEND="app-arch/bzip2:0=
 	virtual/libffi
 	virtual/libintl
 	gdbm? ( sys-libs/gdbm:0=[berkdb] )
-	ncurses? (
-		>=sys-libs/ncurses-5.2:0=
-		readline? ( >=sys-libs/readline-4.1:0= )
-	)
+	ncurses? ( >=sys-libs/ncurses-5.2:0= )
+	readline? ( >=sys-libs/readline-4.1:0= )
 	sqlite? ( >=dev-db/sqlite-3.3.8:3= )
 	ssl? (
 		!libressl? ( dev-libs/openssl:0= )

dev-lang/python/python-3.5.5.ebuild

@@ -31,10 +31,8 @@ RDEPEND="app-arch/bzip2:0=
 	virtual/libffi
 	virtual/libintl
 	gdbm? ( sys-libs/gdbm:0=[berkdb] )
-	ncurses? (
-		>=sys-libs/ncurses-5.2:0=
-		readline? ( >=sys-libs/readline-4.1:0= )
-	)
+	ncurses? ( >=sys-libs/ncurses-5.2:0= )
+	readline? ( >=sys-libs/readline-4.1:0= )
 	sqlite? ( >=dev-db/sqlite-3.3.8:3= )
 	ssl? (
 		!libressl? ( dev-libs/openssl:0= )

dev-lang/python/python-3.6.5.ebuild

@@ -31,10 +31,8 @@ RDEPEND="app-arch/bzip2:0=
 	virtual/libffi
 	virtual/libintl
 	gdbm? ( sys-libs/gdbm:0=[berkdb] )
-	ncurses? (
-		>=sys-libs/ncurses-5.2:0=
-		readline? ( >=sys-libs/readline-4.1:0= )
-	)
+	ncurses? ( >=sys-libs/ncurses-5.2:0= )
+	readline? ( >=sys-libs/readline-4.1:0= )
 	sqlite? ( >=dev-db/sqlite-3.3.8:3= )
 	ssl? (
 		!libressl? ( dev-libs/openssl:0= )