disas: Replace straggling CS_ARCH_SYSZ

When updating to capstone v6, the define CS_ARCH_SYSZ was replaced with CS_ARCH_SYSTEMZ, except here. On systems without capstone-devel installed, this causes a compile error: ../disas/disas-host.c: In function ‘initialize_debug_host’: ../disas/disas-host.c:78:24: error: ‘CS_ARCH_SYSZ’ undeclared (first use in this function); did you mean ‘CS_ARCH_SH’? 78 | s->info.cap_arch = CS_ARCH_SYSZ; | ^~~~~~~~~~~~ | CS_ARCH_SH ../disas/disas-host.c:78:24: note: each undeclared identifier is reported only once for each function it appears in Rather than making capstone required, replace the constant with the same one used elsewhere after that change. Fixes: c8220a096f ("target/s390x: Update capstone disassembly to v6") Signed-off-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20260824143033.306201-1-farman@linux.ibm.com>