hello c++!

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@5830 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/ExDLL/plugin.h

@@ -1,6 +1,10 @@
 #ifndef ___NSIS_PLUGIN__H___
 #define ___NSIS_PLUGIN__H___
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include "api.h"
 
 #ifndef NSISCALL
@@ -56,4 +60,8 @@ void NSISCALL pushstring(const char *str);
 char * NSISCALL getuservariable(const int varnum);
 void NSISCALL setuservariable(const int varnum, const char *var);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif//!___NSIS_PLUGIN__H___