fix bashism in several scripts, thanks ft 0.9.13
-rw-r--r-- 132 .hgsigs
-rw-r--r-- 716 .hgtags
drwxr-xr-x - compile
drwxr-xr-x - debian
-rw-r--r-- 281 makefile.postfix
drwxr-xr-x - manpages
drwxr-xr-x - usr_bin
drwxr-xr-x - usr_sbin