Dynamic allocation of needed user variables (exehead grew 512 bytes).

Independed user vars in uninstaller and installer


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@2656 212acab6-be3b-0410-9dea-997c60f758d6

Source/exehead/fileform.h

@@ -204,6 +204,10 @@ typedef struct
 
   // these point to the header+sections+entries+stringtable in the datablock
   int length_of_header;
+#ifdef NSIS_SUPPORT_NAMED_USERVARS
+  // this store the sized needed to store all user vars
+  int length_of_uservars;
+#endif
 
   // this specifies the length of all the data (including the firstheader and CRC)
   int length_of_all_following_data;