Make GCC happy and make sure Call.sx is not preprocessed by MS toolchain


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6507 212acab6-be3b-0410-9dea-997c60f758d6
Don't use HKCR when uninstalling file associations because it will delete keys under both HKCU and HKLM, we only want to delete the keys we created!


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6508 212acab6-be3b-0410-9dea-997c60f758d6