[PATCH] perf build: Fix compiler errors with old capstone

[Namhyung Kim]

It seems RISCV was added in capstone version 5.  Unfortunately they are
enum constants so cannot check with #ifdef but anyway we can define the
symbols.  Let's do it using the version number to avoid build errors.
It'll fail at runtime though.

  util/capstone.c: In function 'e_machine_to_capstone':
  util/capstone.c:186:25: error: 'CS_ARCH_RISCV' undeclared (first use in this function);
                                  did you mean 'CS_ARCH_SYSZ'?
    186 |                 *arch = CS_ARCH_RISCV;
        |                         ^~~~~~~~~~~~~
        |                         CS_ARCH_SYSZ
  util/capstone.c:186:25: note: each undeclared identifier is reported only once for each function it appears in

  util/capstone.c:187:34: error: 'CS_MODE_RISCV64' undeclared (first use in this function);
                                  did you mean 'CS_MODE_MIPS64'?
    187 |                 *mode |= (is64 ? CS_MODE_RISCV64 : CS_MODE_RISCV32) | CS_MODE_RISCVC;
        |                                  ^~~~~~~~~~~~~~~
        |                                  CS_MODE_MIPS64

Also note that capstone renamed CS_MODE_RISCVC to CS_MODE_RISCV_C which
would cause a different build failure on latest versions.  It's reported
in https://github.com/capstone-engine/capstone/issues/2977 so I think
they will add compatibility layer to prevent the error.

Fixes: 12c4737f55f2 ("perf capstone: Determine architecture from e_machine")
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/capstone.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/util/capstone.c b/tools/perf/util/capstone.c
index 5ad537fea4360e31..dd7cd97d0a38056e 100644
--- a/tools/perf/util/capstone.c
+++ b/tools/perf/util/capstone.c
@@ -24,6 +24,13 @@
 #include "symbol.h"
 #include "thread.h"
 
+#if CS_VERSION_MAJOR < 5
+#define CS_ARCH_RISCV    CS_ARCH_MAX
+#define CS_MODE_RISCV32  1
+#define CS_MODE_RISCV64  2
+#define CS_MODE_RISCVC   4
+#endif
+
 #ifdef LIBCAPSTONE_DLOPEN
 static void *perf_cs_dll_handle(void)
 {
-- 
2.55.0.rc0.799.gd6f94ed593-goog