removing clutter: INIT_blob provision The lost init.c source was reconstructed from init.obj in 2017; prior to that reconstruction we were compiling main.lib from partial source: using the init module in blob form with various binary patches, but recompiling create_RVtasks.c from source so we could change RiViera SWE configuration. We've been using the fully reconstructed version of init.c since 2017, and now the old INIT_blob provision (which is not used by any config) is just extra noise in our targets/*.conf files. This commit removes all bits related to this provision, reducing clutter and making it easier to add new targets.

########################################
# LIBRARIES / MODULES definition       #
########################################

# to avoid multiple nucleus.def (import + include) 
ifndef NUCLEUS_DEF
   NUCLEUS_DEF = 1

### Nucleus libraries
###########################

  ifeq ($(OP_L1_STANDALONE),1)
    OUT_OS_LIB_DIR = $(OUT_LIB_DIR)
  endif

  export OS_FLASH_LIB     = $(OUT_OS_LIB_DIR)/nucleus_flash.lib
  export OS_INT_RAM_LIB   = $(OUT_OS_LIB_DIR)/nucleus_int_ram.lib
  export OS_LIB          := $(OS_FLASH_LIB) $(OS_INT_RAM_LIB)

  MODULES     += $(OS_NUC_DIR)

endif