3735 should include an empty make variable in the default CFLAGS/CCFLAGS
3844 the build should make source-level debugging easier
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>

*** 234,243 ****
--- 234,245 ----
  CFLAGS_uts              += $(CTF_FLAGS_$(CLASS))
  CFLAGS_uts              += $(CERRWARN)
  CFLAGS_uts              += $(CCNOAUTOINLINE)
  CFLAGS_uts              += $(CGLOBALSTATIC)
  CFLAGS_uts              += $(EXTRA_CFLAGS)
+ CFLAGS_uts              += $(CSOURCEDEBUGFLAGS)
+ CFLAGS_uts              += $(CUSERFLAGS)
  
  #
  #       Declare that $(OBJECTS) and $(LINTS) can be compiled in parallel.
  #       The DUMMY target is for those instances where OBJECTS and LINTS
  #       are empty (to avoid an unconditional .PARALLEL).