8051378: AIX: Change "8030763: Validate global memory allocation" breaks the HotSpot build

Reviewed-by: kvn

src/os/aix/vm/os_aix.cpp

@@ -1215,10 +1215,6 @@ void os::die() {
   ::abort();
 }
 
-// Unused on Aix for now.
-void os::set_error_file(const char *logfile) {}
-
-
 // This method is a copy of JDK's sysGetLastErrorString
 // from src/solaris/hpi/src/system_md.c