Fix build with WITH_CCACHE_BUILD with ports that override PATH via

MAKE_ENV or CONFIGURE_ENV. I.e., don't set PATH in MAKE_ENV twice as
env(1) only takes one, in which case some ports fail to build. One
example is any USES=ada port (such as textproc/xmlada). Instead,
add the ccache path into PATH via := and let it fall into there
via the sourcing port's MAKE_ENV=PATH=...:${PATH} line.

A more comprehensive solution to this could be to add a MACRO/feature
to modify the PATH for all ports without using MAKE_ENV via
something like ADDPATH=...

With hat:	portmgr
Tested by:	several exp-runs

0 files changed, 0 insertions, 0 deletions