Revert "net-misc/bird: LTO handling"

This reverts commit 3cdbbb0ada.
Still useless

net-misc/bird/bird-2.0.8.ebuild

@@ -12,7 +12,7 @@ LICENSE="GPL-2"
 
 SLOT="0"
 KEYWORDS="amd64 ~arm64 ~x86 ~x64-macos"
-IUSE="+client debug libssh lto"
+IUSE="+client debug libssh"
 
 RDEPEND="
 	client? ( sys-libs/ncurses:= )
@@ -21,8 +21,7 @@ RDEPEND="
 		acct-group/bird
 		acct-user/bird
 	)
-	libssh? ( net-libs/libssh:= )
-"
+	libssh? ( net-libs/libssh:= )"
 BDEPEND="
 	sys-devel/bison
 	sys-devel/flex
@@ -40,12 +39,7 @@ src_configure() {
 		--localstatedir="${EPREFIX}/var" \
 		$(use_enable client) \
 		$(use_enable debug) \
-		$(use_enable libssh) \
-		$(use !lto && echo bird_cv_c_lto=no)
-}
-
-src_compile() {
-	emake VERBOSE=1
+		$(use_enable libssh)
 }
 
 src_install() {

net-misc/bird/metadata.xml

@@ -19,6 +19,5 @@
 			Enables <pkg>net-libs/libssh</pkg> binding, mendatory for RPKI
 			support
 		</flag>
-		<flag name="lto">Build with Link Time Optimization (LTO)</flag>
 	</use>
 </pkgmetadata>