Changed the CURRENT_CONFIG_INSTALL_DIR to be a variable local to Ceres.
Changed the CURRENT_CONFIG_INSTALL_DIR to be a variable local to Ceres.

This prevents any conflict with other libraries that use a similar syntax.

Change-Id: I7d67b283fb33ef677cc54a00c6ab66b82575422c

ysonggit/ceres-solver,whuaegeanse/ceres-solver,ysonggit/ceres-solver,DougFirErickson/ceres-solver,DougFirErickson/ceres-solver,whuaegeanse/ceres-solver,whuaegeanse/ceres-solver,ysonggit/ceres-solver,whuaegeanse/ceres-solver,ysonggit/ceres-solver,DougFirErickson/ceres-solver,DougFirErickson/ceres-solver