app-i18n/kinput2: force gcc -E for imake's generation

Requires traditional cpp support and is broken in all sort of ways
with clang-cpp / -E. Can still use clang & friends for everything else.

Ideally these packages need to be built another way or last rited,
imake will just accumulate more problems.

Closes: https://bugs.gentoo.org/829063
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

app-i18n/kinput2/kinput2-3.1-r3.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI="8"
@@ -26,7 +26,9 @@ RDEPEND="app-i18n/freewnn
 	x11-libs/libXpm
 	x11-libs/libXt"
 DEPEND="${RDEPEND}"
-BDEPEND="x11-misc/gccmakedep
+BDEPEND="
+	sys-devel/gcc
+	x11-misc/gccmakedep
 	>=x11-misc/imake-1.0.8-r1"
 S="${WORKDIR}/${MY_P}"
 
@@ -45,7 +47,8 @@ src_prepare() {
 }
 
 src_configure() {
-	CC="$(tc-getBUILD_CC)" LD="$(tc-getLD)" IMAKECPP="${IMAKECPP:-$(tc-getCPP)}" xmkmf -a || die
+	CC="$(tc-getBUILD_CC)" LD="$(tc-getLD)" \
+		IMAKECPP="${IMAKECPP:-${CHOST}-gcc -E}" xmkmf -a || die
 }
 
 src_compile() {