Fix missing ChangeLog.jit entries from previous commit
Drop libgccjit.pc

pkg-config appears to be controversial, so don't provide a .pc file.

gcc/ChangeLog.jit:
	* Makefile.in (pkgconfigdir): Drop this.
	(installdirs): Likewise.
	* configure.ac (gcc_version): Don't AC_SUBST this.
	* configure: Regenerate.

gcc/jit/ChangeLog.jit:
	* Make-lang.in (jit.install-common): Drop installation of
	libgccjit.pc.
	* config-lang.in (outputs): Drop jit/libgccjit.pc.
	* libgccjit.pc.in: Delete.
Error-handling within gcc::jit::dump

gcc/jit/ChangeLog.jit:
	* jit-recording.c (gcc::jit::dump::dump): Handle fopen failures
	by emitting an error on the context.
	(gcc::jit::dump::~dump): Likewise for fclose failures.
	(gcc::jit::dump::write): Don't attempt further work if the fopen
	failed.  Handle fwrite failures by emitting an error on the
	context.