community/ioping: fix bug s390x builder

since s390x builder is lxc, the host kernel returns EINVAL when
fadvice() is called with POSIX_FADV_DONTNEED.
Passing -C to ioping allows check() to run. Temp fix for 3.6.

community/ioping/APKBUILD

@@ -18,6 +18,7 @@ _builddir="$srcdir"/$pkgname-$pkgver
 prepare() {
 	local i
 	cd "$_builddir"
+	[ "$CARCH" = "s390x" ] && sed -i -e 's@./$(BINARY)@./$(BINARY) -C@g' Makefile
 	for i in $source; do
 		case $i in
 		*.patch) msg $i; patch -p1 -i "$srcdir"/$i || return 1;;