libssh2_priv msvc: Removed redundant definition of inline keyword

Initially reported by Bob Kast as "Remove redundant 'inline' define".
Thanks a lot.

src/libssh2_priv.h

@@ -108,6 +108,11 @@
 #define TRUE 1
 #endif
 
+#ifdef _MSC_VER
+/* "inline" keyword is valid only with C++ engine! */
+#define inline __inline
+#endif
+
 /* Provide iovec / writev on WIN32 platform. */
 #ifdef WIN32
 
@@ -116,8 +121,6 @@ struct iovec {
     void * iov_base;
 };
 
-#define inline __inline
-
 static inline int writev(int sock, struct iovec *iov, int nvecs)
 {
     DWORD ret;
@@ -136,11 +139,6 @@ static inline int writev(int sock, struct iovec *iov, int nvecs)
 #include <winsock2.h>
 #include <ws2tcpip.h>
 
-#ifdef _MSC_VER
-/* "inline" keyword is valid only with C++ engine! */
-#define inline __inline
-#endif
-
 #endif
 
 /* RFC4253 section 6.1 Maximum Packet Length says: