[Ada] Spurious ineffective with clause warnings on use type clause

[Pierre-Marie de Rodat]

This patch fixes an issue whereby the compiler generates spurious
ineffective with_clause warnings under -gnatwr when the only use of the
with'ed package occurs in a use_type clause in the context area of the
body of the target package and such use_type clause has multiple
prefixes.

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

2020-06-03  Justin Squirek  <squirek@adacore.com>

gcc/ada/

	* sem_ch10.adb (Process_Body_Clauses): Add loop to interate
	through all prefixes in a use_type clause so that all packages
	in the expanded name get examined for effectiveness.
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