INSTALL_PROGRAM or INSTALLPROGRAM? Update docs...

[Oleksandr Gavenko]

>From "14.3 Variables for Specifying Commands":

  Every Makefile should also define the variables `INSTALL_PROGRAM' and
  `INSTALL_DATA'.

>From "14.5 Standard Targets for Users":

  $(INSTALL_PROGRAM) $(INSTALL_DATA)

I look for binutils and Emacs Makefile.in and they both use above variables.

But "Appendix C Complex Makefile Example" provide example with another names:

  INSTALL = /usr/local/bin/install -c
  INSTALLDATA = /usr/local/bin/install -c -m 644

and don't use INSTALL_PROGRAM INSTALL_DATA at all.


"Appendix C" must be updated to prevent from ambiguous.
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Best regards!