wininet: add a stub for ShowClientAuthCerts

[Austin English]

Prevents the crash in http://bugs.winehq.org/show_bug.cgi?id=28829

-- 
-Austin
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diff --git a/dlls/wininet/internet.c b/dlls/wininet/internet.c
index f9e8dea..1c9e6ce 100644
--- a/dlls/wininet/internet.c
+++ b/dlls/wininet/internet.c
@@ -4384,3 +4384,9 @@ BOOL WINAPI InternetQueryFortezzaStatus(DWORD *a, DWORD_PTR b)
     FIXME("(%p, %08lx) stub\n", a, b);
     return 0;
 }
+
+DWORD WINAPI ShowClientAuthCerts(PVOID a)
+{
+    FIXME("%p: stub\n");
+    return 0;
+}
diff --git a/dlls/wininet/wininet.spec b/dlls/wininet/wininet.spec
index 583b7ba..8d5e3ea 100644
--- a/dlls/wininet/wininet.spec
+++ b/dlls/wininet/wininet.spec
@@ -234,7 +234,7 @@
 @ stdcall SetUrlCacheGroupAttributeW(int64 long long ptr ptr)
 @ stub SetUrlCacheHeaderData
 @ stub ShowCertificate
-@ stub ShowClientAuthCerts
+@ stdcall ShowClientAuthCerts(ptr)
 @ stub ShowSecurityInfo
 @ stub ShowX509EncodedCertificate
 @ stdcall UnlockUrlCacheEntryFile(str long) UnlockUrlCacheEntryFileA