app-shells/tcsh-6.24.10: drop USE=doc add USE=man

There is no documentation (html-version of the man-page) any more in
this version.
Install the manpage when USE=man only.

Closes: https://bugs.gentoo.org/923475
Signed-off-by: Fabian Groffen <grobian@gentoo.org>

app-shells/tcsh/tcsh-6.24.10.ebuild

@@ -17,7 +17,7 @@ SRC_URI="
 LICENSE="BSD"
 SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
-IUSE="nls doc"
+IUSE="nls man"
 RESTRICT="test"
 
 # we need gettext because we run autoconf (AM_ICONV)
@@ -26,8 +26,7 @@ RDEPEND="
 	virtual/libcrypt:=
 	virtual/libiconv"
 DEPEND="${RDEPEND}
-	sys-devel/gettext
-	doc? ( dev-lang/perl )"
+	sys-devel/gettext"
 
 CONFDIR=${WORKDIR}/tcsh-gentoo-patches-r${CONFVER}
 
@@ -93,12 +92,13 @@ src_install() {
 	emake DESTDIR="${D}" install install.man
 
 	DOCS=( FAQ Fixes Ported README.md WishList Y2K )
-	if use doc ; then
-		perl tcsh.man2html tcsh.man || die
-		HTML_DOCS=( tcsh.html/*.html )
-	fi
 	einstalldocs
 
+	if use man ; then
+		mv tcsh.man{,1}
+		doman tcsh.man1
+	fi
+
 	insinto /etc
 	doins \
 		"${CONFDIR}"/csh.cshrc \