bc: fix cross-compilation

Closes: #7416 [via git-merge-pr]

srcpkgs/bc/template

@@ -1,7 +1,7 @@
 # Template file for 'bc'
 pkgname=bc
 version=1.07.1
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--with-readline"
 hostmakedepends="ed flex"
@@ -13,16 +13,13 @@ license="GPL-3"
 distfiles="${GNU_SITE}/${pkgname}/${pkgname}-${version}.tar.gz"
 checksum=62adfca89b0a1c0164c2cdca59ca210c1d44c3ffc46daf9931cf4942664cb02a
 disable_parallel_build=yes
-nocross="https://build.voidlinux.eu/builders/armv7l_builder/builds/2093/steps/shell_3/logs/stdio"
 
 if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" bc"
 	pre_build() {
-		(
-		cd bc
-		bc -c libmath.b </dev/null >libmath.h
-		./fix-libmath_h
-		)
+		# don’t run target built binary 'fbc';
+		# run host 'bc' instead
+		sed -i -e 's|^\(\s\+\)./fbc|\1bc|g' bc/Makefile
 	}
 fi
 do_build() {