[Ada] Fix bug in handling of Source_File_Name pragma

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on HEAD

Sometimes, when pragmas Source_File_Name are used (for example with
casing Mixed_Case), the recorded file name is not in lower case.
On platforms where the file names are case-insensitive, this may lead
to have the same file recorded in different ALI file under different
file names, and the generated code may be not compilable.

2005-09-01  Vincent Celier  <celier@adacore.com>

	* lib-writ.adb: Update Copyright notice
	(Write_With_Lines): On platforms where file names are case-insensitive,
	record the file names in lower case.
	(Write_ALI): For D lines, on platforms where file names are
	case-insensitive, record the file names in lower case.

Attachment: difs.24
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