[Ada] Clarify Makefile.adalib comments

[Geert Bosch]

2001-12-04  Arnaud Charlet <charlet@gnat.com>

	* Makefile.adalib: Clarify step 3 (use of gnat.adc) as it causes 
	more confusion than it solves.

*** Makefile.adalib	2001/09/04 08:42:44	1.13
--- Makefile.adalib	2001/10/19 08:21:30	1.14
***************
*** 12,20 ****
  # 2. Copy this Makefile from the standard Adalib directory, e.g.
  #    $ cp /usr/local/gnat/lib/gcc-lib/<target>/2.8.1/adalib/Makefile.adalib .
  #
! # 3. Copy or create a gnat.adc containing the configuration pragmas
! #    you want to use to build the library
! #    e.g. $ cp ~/gnat.adc gnat.adc
  #          
  # 4. Determine the values of the following MACROS
  #      ROOT   (location of GNAT installation, e.g /usr/local)
--- 12,22 ----
  # 2. Copy this Makefile from the standard Adalib directory, e.g.
  #    $ cp /usr/local/gnat/lib/gcc-lib/<target>/2.8.1/adalib/Makefile.adalib .
  #
! # 3. If needed (e.g for pragma Normalize_Scalars), create a gnat.adc
! #    containing the configuration pragmas you want to use to build the library
! #    e.g. $ echo pragma Normalize_Scalars; > gnat.adc
! #    Note that this step is usually not needed, and most pragmas are not
! #    relevant to the GNAT run time. 
  #          
  # 4. Determine the values of the following MACROS
  #      ROOT   (location of GNAT installation, e.g /usr/local)