schannel: Moved the ISC return flag definitions to the SSPI module

Moved our Initialize Security Context return attribute definitions to
the SSPI module, as a) these can be used by other SSPI based providers
and b) the ISC required attributes are defined there.

lib/curl_sspi.h

@@ -64,6 +64,26 @@ extern PSecurityFunctionTable s_pSecFn;
 #define ISC_REQ_USE_HTTP_STYLE                0x01000000
 #endif
 
+#ifndef ISC_RET_REPLAY_DETECT
+#define ISC_RET_REPLAY_DETECT                 0x00000004
+#endif
+
+#ifndef ISC_RET_SEQUENCE_DETECT
+#define ISC_RET_SEQUENCE_DETECT               0x00000008
+#endif
+
+#ifndef ISC_RET_CONFIDENTIALITY
+#define ISC_RET_CONFIDENTIALITY               0x00000010
+#endif
+
+#ifndef ISC_RET_ALLOCATED_MEMORY
+#define ISC_RET_ALLOCATED_MEMORY              0x00000100
+#endif
+
+#ifndef ISC_RET_STREAM
+#define ISC_RET_STREAM                        0x00008000
+#endif
+
 #ifndef SEC_E_INSUFFICIENT_MEMORY
 # define SEC_E_INSUFFICIENT_MEMORY            ((HRESULT)0x80090300L)
 #endif

lib/vtls/curl_schannel.h

@@ -72,27 +72,6 @@
 #define SECBUFFER_ALERT                 17
 #endif
 
-#ifndef ISC_RET_REPLAY_DETECT
-#define ISC_RET_REPLAY_DETECT           0x00000004
-#endif
-
-#ifndef ISC_RET_SEQUENCE_DETECT
-#define ISC_RET_SEQUENCE_DETECT         0x00000008
-#endif
-
-#ifndef ISC_RET_CONFIDENTIALITY
-#define ISC_RET_CONFIDENTIALITY         0x00000010
-#endif
-
-#ifndef ISC_RET_ALLOCATED_MEMORY
-#define ISC_RET_ALLOCATED_MEMORY        0x00000100
-#endif
-
-#ifndef ISC_RET_STREAM
-#define ISC_RET_STREAM                  0x00008000
-#endif
-
-
 #define CURL_SCHANNEL_BUFFER_INIT_SIZE   4096
 #define CURL_SCHANNEL_BUFFER_FREE_SIZE   1024