For error messages with inserted names that include acronyms like SPARK
or CPP, we want to preserve the casing. The list of special-cased named
is currently the same as in gnatpp.

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

gcc/ada/

	* erroutc.adb (Set_Msg_Insertion_Name): Special-case printing with
	acronyms.