*nix build fix

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4259 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/PluginSpecs/PluginSpecs.h

@@ -93,6 +93,11 @@ typedef struct
 	char Name[100];		// Name of the DLL
 } PLUGIN_INFO;
 
+#ifndef MAX_PATH
+// apparently a windows-ism.
+#define MAX_PATH 260
+#endif
+
 // TODO: Remove, or at least remove the void pointers and replace with data.
 // This design is just wrong and ugly - the plugins shouldn't have this much access.
 typedef struct