sci-biology/uchime: workaround failure with GCC 11

Force C++14 for now because we don't really want a large patch for
typedefs.

Closes: https://bugs.gentoo.org/786297
Signed-off-by: Sam James <sam@gentoo.org>

sci-biology/uchime/uchime-4.2.40.ebuild

@@ -4,7 +4,7 @@
 EAPI=7
 
 MY_P="${PN}${PV}_src"
-inherit cmake
+inherit cmake flag-o-matic
 
 DESCRIPTION="Fast, accurate chimera detection"
 HOMEPAGE="https://www.drive5.com/usearch/manual/uchime_algo.html"
@@ -13,7 +13,6 @@ SRC_URI="https://www.drive5.com/${PN}/${MY_P}.tar.gz"
 LICENSE="public-domain"
 SLOT="0"
 KEYWORDS="amd64 x86 ~amd64-linux ~x86-linux"
-IUSE="debug"
 
 S="${WORKDIR}"/${MY_P}
 
@@ -21,3 +20,11 @@ src_prepare() {
 	cp "${FILESDIR}"/CMakeLists.txt . || die
 	cmake_src_prepare
 }
+
+src_configure() {
+	# "myutils.h: error: reference to byte is ambiguous""
+	# bug #786297
+	append-cppflags -std=c++14
+
+	cmake_src_configure
+}