Fixed grep issue in bootloader build target (#3848)

* Changed use of '\s' in grep to '[ \t]' for portability

* Pushed DFU Keyboard.h into a shell script

* Fixed execution permissions on make_dfu_header,sh

tmk_core/avr.mk

@@ -292,14 +292,7 @@ extcoff: $(BUILD_DIR)/$(TARGET).elf
 
 bootloader:
 	make -C lib/lufa/Bootloaders/DFU/ clean
-	printf "#ifndef QMK_KEYBOARD\n#define QMK_KEYBOARD\n\n" > lib/lufa/Bootloaders/DFU/Keyboard.h
+	$(TMK_DIR)/make_dfu_header.sh $(ALL_CONFIGS)
-	printf "%s\n" "`$(GREP) "MANUFACTURER\s" $(ALL_CONFIGS) -h | tail -1`" >> lib/lufa/Bootloaders/DFU/Keyboard.h
-	printf "%s Bootloader\n" "`$(GREP) "PRODUCT\s" $(ALL_CONFIGS) -h | tail -1 | tr -d '\r'`" >> lib/lufa/Bootloaders/DFU/Keyboard.h
-	printf "%s\n" "`$(GREP) "QMK_ESC_OUTPUT\s" $(ALL_CONFIGS) -h | tail -1`" >> lib/lufa/Bootloaders/DFU/Keyboard.h
-	printf "%s\n" "`$(GREP) "QMK_ESC_INPUT\s" $(ALL_CONFIGS) -h | tail -1`" >> lib/lufa/Bootloaders/DFU/Keyboard.h
-	printf "%s\n" "`$(GREP) "QMK_LED\s" $(ALL_CONFIGS) -h | tail -1`" >> lib/lufa/Bootloaders/DFU/Keyboard.h
-	printf "%s\n" "`$(GREP) "QMK_SPEAKER\s" $(ALL_CONFIGS) -h | tail -1`" >> lib/lufa/Bootloaders/DFU/Keyboard.h
-	printf "\n#endif" >> lib/lufa/Bootloaders/DFU/Keyboard.h
 	make -C lib/lufa/Bootloaders/DFU/
 	printf "BootloaderDFU.hex copied to $(TARGET)_bootloader.hex\n"
 	cp lib/lufa/Bootloaders/DFU/BootloaderDFU.hex $(TARGET)_bootloader.hex

tmk_core/make_dfu_header.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+ALL_CONFIGS=$*
+GREP="grep"
+
+cat <<- EOF > lib/lufa/Bootloaders/DFU/Keyboard.h
+#ifndef QMK_KEYBOARD
+#define QMK_KEYBOARD
+
+$($GREP "MANUFACTURER[ \t]" $ALL_CONFIGS -h | tail -1)
+$($GREP "PRODUCT[ \t]" $ALL_CONFIGS -h | tail -1 | tr -d '\r') Bootloader
+$($GREP "QMK_ESC_OUTPUT[ \t]" $ALL_CONFIGS -h | tail -1)
+$($GREP "QMK_ESC_INPUT[ \t]" $ALL_CONFIGS -h | tail -1)
+$($GREP "QMK_LED[ \t]" $ALL_CONFIGS -h | tail -1)
+$($GREP "QMK_SPEAKER[ \t]" $ALL_CONFIGS -h | tail -1)
+#endif
+EOF