Carl Dong f0d7ed10b4 depends: Propagate only specific CLI variables to sub-makes ...

We want to supply well-known vars to ./configure scripts to do with as
they please. However, we do _not_ want to override these well-known vars
at make-time as certain build systems expect a self-mangled version of
these well-known vars.

For example, freetype and bdb will prepend `libtool --mode=compile' to
CC and CXX, which, if we override CC on the command line at make-time,
will break the build.

2020-05-27 17:39:52 -04:00

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