fix up cast to fix errors w/-Wstrict-prototypes

lss/linux_syscall_support.h

 /* Copyright (c) 2005-2011, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2018 matching lines @@
        */
       long long res;
       __asm__ __volatile__("call   2f\n"
                          "0:.align 16\n"
                          "1:movq   %1,%%rax\n"
                            LSS_ENTRYPOINT
                          "2:popq   %0\n"
                            "addq   $(1b-0b),%0\n"
                            : "=a" (res)
                            : "i"  (__NR_rt_sigreturn));
-      return (void (*)())(uintptr_t)res;
+      return (void (*)(void))(uintptr_t)res;
     }
   #elif defined(__ARM_ARCH_3__)
     /* Most definitions of _syscallX() neglect to mark "memory" as being
      * clobbered. This causes problems with compilers, that do a better job
      * at optimizing across __asm__ calls.
      * So, we just have to redefine all of the _syscallX() macros.
      */
     #undef LSS_REG
     #define LSS_REG(r,a) register long __r##r __asm__("r"#r) = (long)a
     #undef  LSS_BODY
@@ skipping 1613 matching lines @@
 # pragma pop_macro("fstat64")
 # pragma pop_macro("lstat64")
 #endif
 
 #if defined(__cplusplus) && !defined(SYS_CPLUSPLUS)
 }
 #endif
 
 #endif
 #endif