* lib/am/distdir.am (distcheck): Strip $(srcdir) prefix on
distributed files, to workaround Sun make VPATH munging.
This fixes subdircond2.test, subdircond3.test, and subpkg.test
on Solaris.
* tests/extra6.test, tests/lex3.test, tests/pr87.test,
tests/pr9.test, tests/target-cflags.test, tests/texinfo13.test,
tests/texinfo16.test, tests/yacc7.test, tests/yaccvpath.test:
Don't require GNU make.