[Ada] Crash on compiling project with multiple subunits per file

[Pierre-Marie de Rodat]

This patch fixes the compiler whereby a project with manually specified
Naming for subunits such that several of the subunits exist in the same
file as the unit they are defined in.

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

2020-06-19  Justin Squirek  <squirek@adacore.com>

gcc/ada/

	* lib.adb (Check_Same_Extended_Unit): Add check to determine if
	the body for the subunits exist in the same file as their
	specifications.
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