Sort object files

ROMs produced of Pop!_OS 20.10 and Fedora 33 with SDCC 4.0.0 cause
uecflash to crash after verifying the block write, leaving the  system
unbootable until all power is removed to force an EC reset.

Sorting object files appears to resolve this issue, creates a smaller
binary (~200 bytes from 20.04), and gives up more reproducible builds.

src/arch/8051/arch.mk

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-3.0-only
 
 CC=sdcc -mmcs51 --model-large --code-size $(CODE_SIZE) --xram-size $(SRAM_SIZE) --Werror
-OBJ=$(patsubst src/%.c,$(BUILD)/%.rel,$(SRC))
+OBJ=$(sort $(patsubst src/%.c,$(BUILD)/%.rel,$(SRC)))
 
 # Run EC rom in simulator
 sim: $(BUILD)/ec.rom

src/arch/avr/arch.mk

@@ -2,7 +2,7 @@
 
 CC=avr-gcc -mmcu=$(EC)
 CFLAGS+=-Os -fstack-usage -Wall -Werror -Wl,--gc-sections -Wl,-u,vfprintf -lprintf_flt
-OBJ=$(patsubst src/%.c,$(BUILD)/%.o,$(SRC))
+OBJ=$(sort $(patsubst src/%.c,$(BUILD)/%.o,$(SRC)))
 
 # Run EC rom in simulator
 sim: $(BUILD)/ec.elf

src/board/system76/common/flash/flash.mk

@@ -17,7 +17,7 @@ FLASH_INCLUDE+=$(wildcard $(FLASH_DIR)/include/flash/*.h) $(FLASH_DIR)/flash.mk
 FLASH_CFLAGS+=-I$(FLASH_DIR)/include -D__FLASH__
 
 FLASH_BUILD=$(BUILD)/flash
-FLASH_OBJ=$(patsubst src/%.c,$(FLASH_BUILD)/%.rel,$(FLASH_SRC))
+FLASH_OBJ=$(sort $(patsubst src/%.c,$(FLASH_BUILD)/%.rel,$(FLASH_SRC)))
 FLASH_CC=\
 	sdcc \
 	-mmcs51 \

src/board/system76/common/scratch/scratch.mk

@@ -20,7 +20,7 @@ SCRATCH_SRC+=\
 	$(SYSTEM76_COMMON_DIR)/smfi.c
 
 SCRATCH_BUILD=$(BUILD)/scratch
-SCRATCH_OBJ=$(patsubst src/%.c,$(SCRATCH_BUILD)/%.rel,$(SCRATCH_SRC))
+SCRATCH_OBJ=$(sort $(patsubst src/%.c,$(SCRATCH_BUILD)/%.rel,$(SCRATCH_SRC)))
 SCRATCH_CC=\
 	sdcc \
 	-mmcs51 \