Issue 5463: Fix dblatex uses xetex backend

Issue 5463: Fix dblatex uses xetex backend

The configure script set PDFLATEX=/path/to/xelatex-with-options.sh
when the system has xelatex.
However, makefile for dblatex document build was checking
PDFLATEX=xelatex
to decide whether to use xetex backend or not.
Therefore, even if the system has xelatex,
dblatex did not use xetex backend.

This commit makes dblatex use xetex backend
when the system has xelatex.

[lemzwerg, 2019-01-19 12:00:17]

https://codereview.appspot.com/344120043/diff/1/make/lilypond-book-vars.make
File make/lilypond-book-vars.make (right):

https://codereview.appspot.com/344120043/diff/1/make/lilypond-book-vars.make#...
make/lilypond-book-vars.make:43: ifneq (,($findstring xelatex,($notdir
$(PDFLATEX))))
Shouldn't this be rather

  ifneq (,$(findstring xelatex,$(notdir $(PDFLATEX))))

?  According to the `make.info`, functions have the syntax `$(foo ...)`.

[trueroad, 2019-01-19 12:59:05]

Fix makefile syntax

[trueroad, 2019-01-19 13:07:00]

Thank you for your reviewing.

https://codereview.appspot.com/344120043/diff/1/make/lilypond-book-vars.make
File make/lilypond-book-vars.make (right):

https://codereview.appspot.com/344120043/diff/1/make/lilypond-book-vars.make#...
make/lilypond-book-vars.make:43: ifneq (,($findstring xelatex,($notdir
$(PDFLATEX))))
On 2019/01/19 12:00:17, lemzwerg wrote:
> Shouldn't this be rather
> 
>   ifneq (,$(findstring xelatex,$(notdir $(PDFLATEX))))
> 
> ?  According to the `make.info`, functions have the syntax `$(foo ...)`.

Done.

[trueroad, 2019-01-26 13:47:34]

I've pushed to the staging.

Issue 5463: Fix dblatex uses xetex backend
commit 002382ca44a8a72260829d1e0d9a73cb93809d08