perf bench syscall: Fix __NR_execve undeclared build error

The __NR_execve definition for i386 was deleted by mistake
in the commit ece7f7c ("perf bench syscall: Add fork
syscall benchmark"), add it to fix the build error on i386.

Fixes: ece7f7c ("perf bench syscall: Add fork syscall benchmark")
Reported-by: Linux Kernel Functional Testing <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
Tested-by: Naresh Kamboju <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Tiezhu Yang <[email protected]>
Cc: [email protected]
Closes: https://lore.kernel.org/all/CA+G9fYvgBR1iB0CorM8OC4AM_w_tFzyQKHc+rF6qPzJL=TbfDQ@mail.gmail.com/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: seehearfeel

tools/arch/x86/include/uapi/asm/unistd_32.h

@@ -2,6 +2,9 @@
 #ifndef __NR_fork
 #define __NR_fork 2
 #endif
+#ifndef __NR_execve
+#define __NR_execve 11
+#endif
 #ifndef __NR_getppid
 #define __NR_getppid 64
 #endif