[PATCH] TestCompile: ease standalone debugging

[Martin Kraemer <Ma...@mch.sni.de>]

When something goes wrong during "configure" or "Configure" execution,
it is often difficult to find out what exactly went wrong. More often
than not, the TestCompile utility detected a missing library or file.

a) we should add a HINT: to use "VERBOSE=yes ./configure" to enable
   printing of the compiler error messages

b) we should improve the usage of TestCompile so that a user can call
   it from the command line to see what's wrong
   (e.g., helpers/TestCompile -v lib db dbopen).
Currently, the latter is difficult, because TestCompile uses $(MAKE)
to start the compilation -- but $MAKE is usually unset (unless called
by make or set manually).
The following patch falls back to using make if $(MAKE) is unset. This
helps in debugging from the command line.

    Martin
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