[Ada] gnatmake -f -u <main> always invokes the compiler

[Arnaud Charlet <charlet at adacore dot com>]

As documented, gnatmake -f -u <main> should always invoke the compiler.
This patch ensures that it is aways true, even when the ALI file is
read-only, when the source is in a directory specified with -aL or is
a direct source of an externally built project.

Tested on x86_64-pc-linux-gnu, committed on trunk

2010-06-18  Vincent Celier  <celier@adacore.com>

	* make.adb (Must_Compile): New Boolean global variable
	(Main_On_Command_Line): New Boolean global variable
	(Collect_Arguments_And_Compile): Do compile if Must_Compile is True,
	even when the project is externally built.
	(Start_Compile_If_Possible): Compile in -aL directories if
	Check_Readonly_Files is True. Do compile if Must_Compile is True, even
	when the project is externally built.
	(Gnatmake): Set Must_Compile and Check_Readonly_Files to True when
	invoked with -f -u and one or several mains on the command line.
	(Scan_Make_Arg): Set Main_On_Command_Line to True when at least one main
	is specified on the command line.

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