sim: m32r: include more glibc headers for the funcs we use [PR sim/29752]

Not exactly portable, but doesn't make the situation worse here, and
fixes a lot of implicit function warnings.

Bug: https://sourceware.org/PR29752

sim/m32r/traps.c

@@ -38,9 +38,14 @@
    NB: The emulation is also missing argument conversion (endian & bitsize)
    even on Linux hosts.  */
 #ifdef __linux__
+#include <syslog.h>
+#include <sys/file.h>
+#include <sys/fsuid.h>
+#include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/poll.h>
 #include <sys/resource.h>
+#include <sys/sendfile.h>
 #include <sys/sysinfo.h>
 #include <sys/stat.h>
 #include <sys/time.h>