[Ada] Linker_Section_Pragma cleanup

[Pierre-Marie de Rodat]

Remove Linker_Section_Pragma field from Record_Field_Kind.

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

gcc/ada/

	* gen_il-gen-gen_entities.adb: Remove Linker_Section_Pragma
	field from Record_Field_Kind.  Minor comment improvement.
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