Fixed some minor compile/install bugs.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@766 0fc631ac-6414-0410-93d0-97cfa31319b6

tools/linux-installer/install

@@ -8,8 +8,8 @@
 # If executed as root (including via sudo), it is installed to /usr/local/share/magicseteditor. (with an executable symlink in /usr/local/bin)
 # If executed as any other user, it will fail.
 
-case `id -un` in
-	root)
+case $UID in
+	0)
 		INSTALL_DIR='/usr/local/share/magicseteditor/';
 		EXEC_SYMLINK='/usr/local/bin/magicseteditor';;
 	*)