Missing libdir when installing the .def file

[LRN]

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src/Makefile.am reads:

 install-def-file:
 	$(INSTALL) $(srcdir)/libgcrypt.def $(DESTDIR)$(libdir)/libgcrypt.def

This normally works - except for the cases of installing into a
staging directory. Staging directory is empty initially, it doesn't
have libdir in it. When libgcrypt is installed concurrently (with make
install -jX), libdir might not be created prior to running
install-def-file recipe.
This is fixed by doing
	$(INSTALL) -d $(DESTDIR)$(libdir)
before installing the .def file.
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