Issue Type: Bug

If the function without parameter, but the function declaration with 'void' in header file. In other file (not the function entity file) call the function. Using F12 (Go to Definition), the editor will just jump to the header file, not the function entify '*.c' file.

Eg.:
file1: testA.c
void test_a()
{
/* function entity*/
}

file2: testA.h
extern void test_a(void);

file3: testB.c
#include "testA.h"

void test_b(void)
{
test_a();
}

When 'Go to Definition' to test_a(); the editor will jump to testA.h file not testA.c file. But if testA.c is
void test_a(void)
{
/* function entity */
}
It can jump to the testA.c file.

Extension version: 0.23.0
VS Code version: Code 1.33.1 (51b0b28134d51361cf996d2f0a1c698247aeabd8, 2019-04-11T08:27:14.102Z)
OS version: Windows_NT x64 10.0.16299