Makefile: print failing command in condensed mode.

When make output is condensed, showing a summary of each build
step in the style "CC txr.c -> opt/txr.o", as is the case by
default, the failing build command is now shown.

Previously, a failed build had to be re-invoked with
make VERBOSE=y to show the failing command.

* Makefile (SH): New macro.
(COMPILE_C, COMPILE_C_WITH_DEPS, LINK_PROG, WINDRES, INSTALL):
These macros now invoke commands via SH rather than directly.
(lex.yy.c, y.tab.h, y.tab.c, install-tests, %): Recipes for these
targets use SH macro for executing shell commands rather than
specifying them directly.
(tst/%.out, %.ok, %.expected): These test-related pattern
rules also use SH.

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