testing/rdma-core: disable on riscv64

>>> ERROR: rdma-core*: Found textrels:
TEXTREL  /home/buildozer/aports/testing/rdma-core/pkg/rdma-core/usr/sbin/ibacm

testing/rdma-core/APKBUILD

@@ -5,8 +5,8 @@ pkgver=38.1
 pkgrel=0
 pkgdesc="RDMA core userspace libraries and daemons"
 url="https://github.com/linux-rdma/rdma-core"
-arch="all"
 license="GPL-2.0-only OR BSD-2-Clause"
+arch="all !riscv64" # textrels
 options="!check" # tests are for installation
 makedepends="
 	cmake