Fix servatrice compilation with msvc

servatrice/src/smtp/smtpexports.h

 #ifndef SMTPEXPORTS_H
 #define SMTPEXPORTS_H
 
+/*
 #ifdef SMTP_BUILD
 #define SMTP_EXPORT Q_DECL_EXPORT
 #else
 #define SMTP_EXPORT Q_DECL_IMPORT
 #endif
+*/
+
+// Servatrice compiles this statically in, so there's no need to declare exports
+#define SMTP_EXPORT
 
 #endif // SMTPEXPORTS_H