Fix parallel initial build failing

tools/build/check-nqp-version.pl did run and produced a correct nqp-version
file, but at that point it was already too late. While it was running, make
tried to check the dependency for other parts and gen/nqp-version was not
available yet and there was no explicit recipe for creating it either.

Mark the Makefile as .NOTPARALLEL, which gets rid of the whole issue. This is
a GNU extension however, so the issue may still remain for other makes.

Fix GH #1654

tools/build/Makefile-common-macros.in

@@ -1,5 +1,7 @@
 # Copyright (C) 2015 The Perl Foundation
 
+.NOTPARALLEL:
+
 PERL5   = @perl@
 MKPATH  = @mkpath@
 CHMOD   = @chmod@