Implemented SymEnumLines.

diff --git a/include/dbghelp.h b/include/dbghelp.h
index 8ec5f93..d6c9f44 100644
--- a/include/dbghelp.h
+++ b/include/dbghelp.h
@@ -749,6 +749,19 @@
 BOOL WINAPI SymGetLineFromAddr(HANDLE, DWORD, PDWORD, PIMAGEHLP_LINE);
 BOOL WINAPI SymGetLinePrev(HANDLE, PIMAGEHLP_LINE);
 BOOL WINAPI SymGetLineNext(HANDLE, PIMAGEHLP_LINE);
+typedef struct _SRCCODEINFO
+{
+    DWORD       SizeOfStruct;
+    PVOID       Key;
+    DWORD64     ModBase;
+    char        Obj[MAX_PATH+1];
+    char        FileName[MAX_PATH+1];
+    DWORD       LineNumber;
+    DWORD64     Address;
+} SRCCODEINFO, *PSRCCODEINFO;
+
+typedef BOOL (CALLBACK* PSYM_ENUMLINES_CALLBACK)(PSRCCODEINFO, PVOID);
+BOOL WINAPI SymEnumLines(HANDLE, ULONG64, PCSTR, PCSTR, PSYM_ENUMLINES_CALLBACK, PVOID);
 
 /*************************
  * File & image handling *