Reduce compile size to fix various Travis CI errors (#6426)

Due to feature creep

keyboards/clueboard/card/rules.mk

@@ -19,3 +19,5 @@ MIDI_ENABLE = no           # MIDI controls
 UNICODE_ENABLE = no        # Unicode
 BLUETOOTH_ENABLE = no      # Enable Bluetooth with the Adafruit EZ-Key HID
 AUDIO_ENABLE = yes         # Audio output on port C6
+
+LINK_TIME_OPTIMIZATION_ENABLE = yes

keyboards/preonic/rev1/rules.mk

@@ -35,7 +35,7 @@ F_USB = $(F_CPU)
 
 # Bootloader
 #     This definition is optional, and if your keyboard supports multiple bootloaders of
-#     different sizes, comment this out, and the correct address will be loaded 
+#     different sizes, comment this out, and the correct address will be loaded
 #     automatically (+60). See bootloader.mk for all options.
 BOOTLOADER = atmel-dfu
 
@@ -43,13 +43,13 @@ BOOTLOADER = atmel-dfu
 OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
 
 # Build Options
-#   change to "no" to disable the options, or define them in the Makefile in 
+#   change to "no" to disable the options, or define them in the Makefile in
 #   the appropriate keymap folder that will get included automatically
 #
 BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration(+1000)
 MOUSEKEY_ENABLE = no       # Mouse keys(+4700)
 EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
-CONSOLE_ENABLE = yes         # Console for debug(+400)
+CONSOLE_ENABLE = no         # Console for debug(+400)
 COMMAND_ENABLE = no        # Commands for debug and configuration
 NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
 BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
@@ -64,3 +64,5 @@ API_SYSEX_ENABLE = no
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
 LAYOUTS = ortho_5x12
+
+LINK_TIME_OPTIMIZATION_ENABLE = yes

keyboards/preonic/rev2/rules.mk

@@ -35,7 +35,7 @@ F_USB = $(F_CPU)
 
 # Bootloader
 #     This definition is optional, and if your keyboard supports multiple bootloaders of
-#     different sizes, comment this out, and the correct address will be loaded 
+#     different sizes, comment this out, and the correct address will be loaded
 #     automatically (+60). See bootloader.mk for all options.
 BOOTLOADER = qmk-dfu
 
@@ -43,18 +43,18 @@ BOOTLOADER = qmk-dfu
 OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
 
 # Build Options
-#   change to "no" to disable the options, or define them in the Makefile in 
+#   change to "no" to disable the options, or define them in the Makefile in
 #   the appropriate keymap folder that will get included automatically
 #
 BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration(+1000)
-MOUSEKEY_ENABLE = no       # Mouse keys(+4700)
+MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
 EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
-CONSOLE_ENABLE = yes         # Console for debug(+400)
-COMMAND_ENABLE = no        # Commands for debug and configuration
+CONSOLE_ENABLE = yes        # Console for debug(+400)
+COMMAND_ENABLE = no         # Commands for debug and configuration
 NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
 BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
 MIDI_ENABLE = no            # MIDI controls
-AUDIO_ENABLE = yes           # Audio output on port C6
+AUDIO_ENABLE = yes          # Audio output on port C6
 UNICODE_ENABLE = no         # Unicode
 BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.
@@ -64,3 +64,5 @@ API_SYSEX_ENABLE = no
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
 LAYOUTS = ortho_5x12
+
+LINK_TIME_OPTIMIZATION_ENABLE = yes

keyboards/xd004/v1/rules.mk

@@ -63,7 +63,7 @@ UNICODE_ENABLE = no         # Unicode
 BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.
 SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
-
+SPACE_CADET_ENABLE = no
 # Saves about 5% of space:
 LINK_TIME_OPTIMIZATION_ENABLE = yes