ada: Improve preprocessor error handling.

In some cases, gnatprep would correctly emit an error message and then
incorrectly exit with a return code of zero, indicating success.
In some cases, a correct message about an error detected by the integrated
preprocessor would be accompanied by an incorrect message indicating that
a source file could not be found.

gcc/ada/

	* gprep.adb (Process_Files.Process_One_File): When calling OS_Exit in an error
	path, pass in a Status parameter of 1 instead of 0 (because 0
	indicates success).
	* lib-load.adb (Load_Main_Source): Do not emit a message about a missing source file
	if other error messages were generated by calling Load_Source_File;
	the file isn't missing - it failed preprocessing.

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