For musl libc instead of including <sys/ioctl.h>, which leads to
an error when redefining ioctl(3) and close(3), just define the
prototype for ioctl().

--- benchmarks/gem_exec_tracer.c	2015-08-17 18:38:30.000000000 +0200
+++ benchmarks/gem_exec_tracer.c	2015-09-13 17:03:34.768431063 +0200
@@ -32,7 +32,11 @@
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#if defined(__GLIBC__)
 #include <sys/ioctl.h>
+#else
+int ioctl(int fd, unsigned long request, ...);
+#endif
 #include <unistd.h>
 #include <errno.h>
 #include <sys/mman.h>
--- tools/aubdump.c	2015-09-08 19:01:19.000000000 +0200
+++ tools/aubdump.c	2015-09-13 17:06:27.850430550 +0200
@@ -32,7 +32,11 @@
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#if defined(__GLIBC__)
 #include <sys/ioctl.h>
+#else
+int ioctl(int fd, unsigned long request, ...);
+#endif
 #include <unistd.h>
 #include <errno.h>
 #include <sys/mman.h>