imagehlp: Added a few more forward definitions to dbghelp.

dlls/imagehlp/imagehlp.spec

 @ stdcall BindImage(str str str)
 @ stdcall BindImageEx(long str str str ptr)
 @ stdcall CheckSumMappedFile(ptr long ptr ptr)
-@ stub EnumerateLoadedModules64
+@ stdcall EnumerateLoadedModules64(long ptr ptr) dbghelp.EnumerateLoadedModules64
 @ stdcall EnumerateLoadedModules(long ptr ptr) dbghelp.EnumerateLoadedModules
 @ stdcall FindDebugInfoFile(str str str) dbghelp.FindDebugInfoFile
 @ stdcall FindDebugInfoFileEx(str str ptr ptr ptr) dbghelp.FindDebugInfoFileEx
@@ -54,7 +54,7 @@
 @ stdcall SymEnumerateSymbols(long long ptr ptr) dbghelp.SymEnumerateSymbols
 @ stub SymEnumerateSymbolsW64
 @ stub SymEnumerateSymbolsW
-@ stub SymFindFileInPath
+@ stdcall SymFindFileInPath(long str str ptr long long long ptr ptr ptr) dbghelp.SymFindFileInPath
 @ stdcall SymFromAddr(long long ptr ptr) dbghelp.SymFromAddr
 @ stdcall SymFromName(long str ptr) dbghelp.SymFromName
 @ stdcall SymFunctionTableAccess64(long double) dbghelp.SymFunctionTableAccess64
@@ -88,8 +88,8 @@
 @ stdcall SymInitialize(long str long) dbghelp.SymInitialize
 @ stdcall SymLoadModule64(long long str str double long) dbghelp.SymLoadModule64
 @ stdcall SymLoadModule(long long str str long long) dbghelp.SymLoadModule
-@ stub SymMatchFileName
-@ stub SymMatchString
+@ stdcall SymMatchFileName(str str ptr ptr) dbghelp.SymMatchFileName
+@ stdcall SymMatchString(str str long) dbghelp.SymMatchString
 @ stdcall SymRegisterCallback64(long ptr double) dbghelp.SymRegisterCallback64
 @ stdcall SymRegisterCallback(long ptr ptr) dbghelp.SymRegisterCallback
 @ stdcall SymRegisterFunctionEntryCallback64(ptr ptr double) dbghelp.SymRegisterFunctionEntryCallback64