dev-cpp/gflags: Update doc install

Update the list of installed doc files to match upstream updates. Do not
install AUTHORS file since it does not list anyone. Do not install HTML
docs from doc/ since that file is missing from release tarballs.

dev-cpp/gflags/gflags-9999.ebuild

@@ -20,6 +20,9 @@ LICENSE="BSD"
 SLOT="0"
 IUSE="static-libs"
 
+# AUTHORS.txt only links the google group
+DOCS=( ChangeLog.txt README.md )
+
 multilib_src_configure() {
 	local mycmakeargs=(
 		-DBUILD_SHARED_LIBS=ON
@@ -27,9 +30,3 @@ multilib_src_configure() {
 	)
 	cmake-utils_src_configure
 }
-
-multilib_src_install_all() {
-	rm -rf "${ED}"/usr/share/doc
-	dodoc {AUTHORS,ChangeLog,NEWS,README}.txt
-	dohtml doc/*
-}