cw: give cw(1onbld) a new interface allowing for multiple arbitrary shadows

*** 194,205 ****
  export BUILD_TOOLS='/opt'
  #export ONBLD_TOOLS='/opt/onbld'
  export SPRO_ROOT='/opt/SUNWspro'
  export SPRO_VROOT="$SPRO_ROOT"
  
! # Disable shadow compilation by default.
! export CW_NO_SHADOW='1'
  
  # This goes along with lint - it is a series of the form "A [y|n]" which
  # means "go to directory A and run 'make lint'" Then mail me (y) the
  # difference in the lint output. 'y' should only be used if the area you're
  # linting is actually lint clean or you'll get lots of mail.
--- 194,227 ----
  export BUILD_TOOLS='/opt'
  #export ONBLD_TOOLS='/opt/onbld'
  export SPRO_ROOT='/opt/SUNWspro'
  export SPRO_VROOT="$SPRO_ROOT"
  
! # Compilers maybe specified using the following variables:
! # PRIMARY_CC    - primary C compiler
! # PRIMARY_CCC   - primary C++ compiler
! #
! # SHADOW_CCS    - list of shadow C compilers
! # SHADOW_CCCS   - list of shadow C++ compilers
! #
! # Each entry has the form <name>,<path to binary>,<style> where name is a
! # free-form name (possibly used in the makefiles to guard options), path is
! # the path to the executable.  style is the 'style' of command line taken by
! # the compiler, currently either gnu/gcc or sun/cc (also used by Makefiles to
! # guard options).
! #
! # __SUNC and __GNUC must still be set to reflect the style of the primary
! # compiler (and to influence the default primary, otherwise)
! #
! # for example:
! # export PRIMARY_CC=gcc4,/opt/gcc/4.4.4/bin/gcc,gnu
! # export PRIMARY_CCC=gcc4,/opt/gcc/4.4.4/bin/g++,gnu
! # export SHADOW_CCS=studio12,/opt/SUNWspro/bin/cc,sun
! # export SHADOW_CCCS=studio12,/opt/SUNWspro/bin/CC,sun
! #
! # There can be several space-separated entries in SHADOW_* to run multiple
! # shadow compilers.
  
  # This goes along with lint - it is a series of the form "A [y|n]" which
  # means "go to directory A and run 'make lint'" Then mail me (y) the
  # difference in the lint output. 'y' should only be used if the area you're
  # linting is actually lint clean or you'll get lots of mail.