Don't show the uc_backtrace_fd function when generating a backtrace.

src/ucore_backtrace.c

@@ -1,14 +1,23 @@
 #include <execinfo.h>
+#include <stdio.h>
 
 #define MAX_BACKTRACE_SYMBOLS 96
 
 void uc_backtrace_fd(int fd)
 {
     void *buffer[MAX_BACKTRACE_SYMBOLS];
+    void **syms;
     int ptrs;
 
     ptrs = backtrace(buffer, MAX_BACKTRACE_SYMBOLS);
-    backtrace_symbols_fd(buffer, ptrs, fd);
+    if(ptrs > 0) { //dont print out this function
+        ptrs--;
+        syms = &buffer[1];
+    } else {
+        syms = &buffer[0];
+    }
+
+    backtrace_symbols_fd(syms, ptrs, fd);
 }