feature suggestion - ** for recursive globbing

[Nelson Minar]

Java Makefiles have a problem; .java files end up being in lots of
little directories. How about expanding make's globbing rules to
include a recursive decent? Ie:
  $(wildcard java-src/**/*.java)
Which would be like doing
  $(shell find java-src -name *.java)

The "**" convention is used pretty consistently in a lot of Unix
tools, although I don't know if any GNU tools do it.

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