remove more C headers

vlib/builtin/cfns.v

@@ -14,9 +14,13 @@ fn C.isdigit(s byteptr) bool
 
 
 
+// <execinfo.h>
 fn backtrace(a voidptr, b int) int
 fn backtrace_symbols_fd(voidptr, int, int)
 
+// <libproc.h>
+fn proc_pidpath(int, voidptr, int) int
+
 
 
 // Windows

vlib/compiler/cheaders.v

@@ -19,21 +19,6 @@ CommonCHeaders = '
 #endif
 
 
-#ifdef __APPLE__
-#include <libproc.h> // proc_pidpath
-//#include <execinfo.h> // backtrace and backtrace_symbols_fd
-#endif
-
-#ifdef __linux__
-//#if !defined(__BIONIC__) && !defined(__GNUC_PREREQ)
-//#include <execinfo.h> // backtrace and backtrace_symbols_fd
-//#endif
-
-#pragma weak backtrace
-#pragma weak backtrace_symbols_fd
-#endif
-
-
 #ifdef __linux__
 #include <sys/types.h>
 #include <sys/wait.h> // os__wait uses wait on nix

vlib/os/os.v

@@ -700,7 +700,7 @@ pub fn executable() string {
 	$if mac {
 		mut result := malloc(MAX_PATH)
 		pid := C.getpid()
-		ret := C.proc_pidpath (pid, result, MAX_PATH)
+		ret := proc_pidpath (pid, result, MAX_PATH)
 		if ret <= 0  {
 			println('os.executable() failed')
 			return '.'