Restore the default `make' target. (issue 13290047)

[dak]

https://codereview.appspot.com/13290047/diff/1/stepmake/stepmake/generic-targets.make
File stepmake/stepmake/generic-targets.make (right):

https://codereview.appspot.com/13290047/diff/1/stepmake/stepmake/generic-targets.make#newcode1
stepmake/stepmake/generic-targets.make:1: .PHONY : all clean bin-clean
default dist exe help html lib man TAGS\
That change might be independently useful.

https://codereview.appspot.com/13290047/diff/1/stepmake/stepmake/generic-targets.make#newcode5
stepmake/stepmake/generic-targets.make:5: default: all
I have no idea what makes you think that default is not a defined target
for most Makefiles.

git grep "^default:"

turns up a host of default targets.

Documentation/GNUmakefile:default: local-txt-doc
Documentation/css/GNUmakefile:default:
Documentation/logo/GNUmakefile:default: $(lilypond-icon) $(ly-icon)
Documentation/misc/GNUmakefile:default: local-txt-doc
Documentation/pictures/GNUmakefile:default:
GNUmakefile.in:default: $(config_h) build-dir-setup build-scripts
lily/GNUmakefile:default:
make/abc-targets.make:default:
make/doc-i18n-root-targets.make:default:
make/lilypond-book-targets.make:default:
make/midi-targets.make:default:
make/musicxml-targets.make:default:
mf/GNUmakefile:default: $(ALL_GEN_FILES) \
po/GNUmakefile:default: $(MO_FILES)
python/GNUmakefile:default: $(outdir)/relocate-preamble.py
python/auxiliar/GNUmakefile:default:
stepmake/stepmake/automatically-generated.sub.make:default:
stepmake/stepmake/documentation-targets.make:default:
stepmake/stepmake/executable-targets.make:default: $(EXECUTABLE)
stepmake/stepmake/help2man-targets.make:default: man
stepmake/stepmake/library-targets.make:default: $(LIBRARY)
stepmake/stepmake/python-module-targets.make:default: $(OUT_PY_MODULES)
$(OUT_PY
stepmake/stepmake/shared-library-targets.make:default: $(SHARED_LIBRARY)
stepmake/stepmake/texinfo-targets.make:default: $(INFO_FILES)
stepmake/stepmake/topdocs-targets.make:default: local-txt-doc

So you should likely check which particular Makefile is missing a
default target and double-check by trying "make default" since there are
a lot of opportunities for having the default target defined in an
include file.

https://codereview.appspot.com/13290047/