dev-util/re2c: regenerate autotools for nonbash patch

While the used patch does modify configure directly,
this is fragile and sometimes causes maintainer mode
to be triggered regardless. Let's regenerate autotools
to be safe given a user managed to hit this.

Closes: https://bugs.gentoo.org/779187
Signed-off-by: Sam James <sam@gentoo.org>

dev-util/re2c/re2c-2.1.1-r1.ebuild

@@ -3,6 +3,8 @@
 
 EAPI=7
 
+inherit autotools
+
 DESCRIPTION="tool for generating C-based recognizers from regular expressions"
 HOMEPAGE="http://re2c.org/"
 SRC_URI="https://github.com/skvadrik/re2c/releases/download/${PV}/${P}.tar.xz"
@@ -14,6 +16,16 @@ IUSE="debug"
 
 PATCHES=("${FILESDIR}"/${P}-sh.patch)
 
+src_prepare() {
+	default
+
+	# Only needed for the sh patch
+	# Despite the patch modifying the configure directly,
+	# this is sometimes fragile and triggers maintainer mode anyway.
+	# bug #779187
+	eautoreconf
+}
+
 src_configure() {
 	econf \
 		--enable-golang \