Format corrections for various "Makefile.am": Leading tab, no trailing blank.

client/Makefile.am:
  "Makefile" command lines must start with a tab, not with blanks.
libmysqld/Makefile.am:
  "Makefile" command lines must start with a tab, not with blanks.
netware/Makefile.am:
  "Makefile" command lines must start with a tab, not with blanks.
scripts/Makefile.am:
  "Makefile" command lines must start with a tab, not with blanks.
win/Makefile.am:
  After a backslash (to mark a continuation line) there must not be a trailing blank.