Revert "dev-libs/sexpp: add 0.8.7"

This reverts commit 4f562e1964.

 - upstream renamed the header file >0.8.6, waiting for reverse deps
   to catch up before bumping.

Closes: https://bugs.gentoo.org/929213
Signed-off-by: Joonas Niilola <juippis@gentoo.org>

dev-libs/sexpp/Manifest

@@ -1,2 +1 @@
 DIST sexpp-0.8.6.tar.gz 46857 BLAKE2B 5ff8eaf3ba81af243e6780604b51b43743ed7f9de6121c1de273bbbd51d42e3feed3c00357c85ccaa5e808d2e5f753f58b5f96fea38f5b50b2b2bd9ee658be74 SHA512 b2698a397ef1b161a722e1834bc62f6d2b27c403faa27d97e1e137cc7315e004252ac75bbaaf817bc705f7830cb89665bb23ba8d18904fedd6c2f01c5f1e6f0f
-DIST sexpp-0.8.7.tar.gz 46958 BLAKE2B 1b7d45f00769b54c152c25e3befe73db628b8db880ed8b14cc3e1b4c07f90859d2994cbc3a03cad7dfdcc2a20ec4df4263bd04b17ef27f1d3a96e46e6d214923 SHA512 28b93626887da3c1228ddbb9b8566f2d9895f263a1fc31ac2cfa6fc0215cb6a8ec31900255335792bfd580d10f53dd3f88274df83f8c0ddff62ebe35dce7da08

dev-libs/sexpp/sexpp-0.8.7.ebuild

@@ -1,34 +0,0 @@
-# Copyright 2023-2024 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-inherit cmake
-
-DESCRIPTION="S-expressions parser and generator library in C++"
-HOMEPAGE="https://github.com/rnpgp/sexpp"
-SRC_URI="https://github.com/rnpgp/sexpp/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
-
-LICENSE="MIT"
-SLOT="0"
-KEYWORDS="~amd64 ~arm64 ~loong ~ppc64 ~x86"
-IUSE="cli test"
-RESTRICT="!test? ( test )"
-
-BDEPEND="virtual/pkgconfig
-	test? ( dev-cpp/gtest )"
-
-src_configure() {
-	local mycmakeargs=(
-		-DBUILD_SHARED_LIBS=on
-
-		-DDOWNLOAD_GTEST=off
-
-		-DWITH_COVERAGE=off
-		-DWITH_SANITIZERS=off
-		-DWITH_SEXP_CLI=$(usex cli on off)
-		-DWITH_SEXP_TESTS=$(usex test on off)
-	)
-
-	cmake_src_configure
-}