crypt32: Add stub for CertFreeCertificateChain.

dlls/crypt32/crypt32.spec

diff --git a/dlls/crypt32/crypt32.spec b/dlls/crypt32/crypt32.spec
index 8fbaecd..bae473c 100644
--- a/dlls/crypt32/crypt32.spec
+++ b/dlls/crypt32/crypt32.spec
@@ -45,7 +45,7 @@
 @ stub CertFindSubjectInCTL
 @ stdcall CertFreeCRLContext(ptr)
 @ stdcall CertFreeCTLContext(ptr)
-@ stub CertFreeCertificateChain
+@ stdcall CertFreeCertificateChain(ptr)
 @ stdcall CertFreeCertificateChainEngine(ptr)
 @ stdcall CertFreeCertificateContext(ptr)
 @ stdcall CertGetCRLContextProperty(ptr long ptr ptr)