Enhance build system so that "make V=1" works like the Linux Kernel

If gmake is available, the developer can use "make V=1" instead of
using a configure-time switch, --enable-verbose-makecmds, to see all
of the commands executed by the Makefile.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/configure b/configure
index 9460d3b..769dc09 100755
--- a/configure
+++ b/configure
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