Re: Use $(MAKE) instead of 'make' in lilypond-book regtests (issue 569400043 by hanwenn@gmail.com)

[hanwenn]

https://codereview.appspot.com/569400043/diff/549600043/input/regression/lilypond-book/GNUmakefile
File input/regression/lilypond-book/GNUmakefile (right):

https://codereview.appspot.com/569400043/diff/549600043/input/regression/lilypond-book/GNUmakefile#newcode42
input/regression/lilypond-book/GNUmakefile:42: .NOTPARALLEL:
here.

https://codereview.appspot.com/569400043/