DM: fixed math lib paths for m0 boards

Author: deanm1278

boards.txt

@@ -41,7 +41,7 @@ adafruit_feather_m0.build.vid=0x239A
 adafruit_feather_m0.build.pid=0x800B
 adafruit_feather_m0.bootloader.tool=openocd
 adafruit_feather_m0.bootloader.file=feather/samd21_sam_ba.bin
-adafruit_feather_m0.compiler.arm.cmsis.ldflags=-larm_cortexM0l_math
+adafruit_feather_m0.compiler.arm.cmsis.ldflags="-L{runtime.tools.CMSIS-4.5.0.path}/CMSIS/Lib/GCC/" -larm_cortexM0l_math
 
 adafruit_feather_m0_express.name=Adafruit Feather M0 Express
 adafruit_feather_m0_express.vid.0=0x239A
@@ -69,6 +69,7 @@ adafruit_feather_m0_express.build.vid=0x239A
 adafruit_feather_m0_express.build.pid=0x801B
 adafruit_feather_m0_express.bootloader.tool=openocd
 adafruit_feather_m0_express.bootloader.file=feather/samd21_sam_ba.bin
+adafruit_feather_m0_express.compiler.arm.cmsis.ldflags="-L{runtime.tools.CMSIS-4.5.0.path}/CMSIS/Lib/GCC/" -larm_cortexM0l_math
 
 #adafruit_radio_m0.name=Adafruit M0 Radio (Native USB Port)
 #adafruit_radio_m0.vid.0=0x239A
@@ -123,6 +124,7 @@ adafruit_metro_m0.build.vid=0x239A
 adafruit_metro_m0.build.pid=0x8013
 adafruit_metro_m0.bootloader.tool=openocd
 adafruit_metro_m0.bootloader.file=metro/samd21_sam_ba.bin
+adafruit_metro_m0.compiler.arm.cmsis.ldflags="-L{runtime.tools.CMSIS-4.5.0.path}/CMSIS/Lib/GCC/" -larm_cortexM0l_math
 
 # Adafruit Circuit Playground M0
 # ------------------------------
@@ -152,6 +154,7 @@ adafruit_circuitplayground_m0.build.vid=0x239A
 adafruit_circuitplayground_m0.build.pid=0x8018
 adafruit_circuitplayground_m0.bootloader.tool=openocd
 adafruit_circuitplayground_m0.bootloader.file=circuitplay/circuitplay_m0_samd21g18_sam_ba.bin
+adafruit_circuitplayground_m0.compiler.arm.cmsis.ldflags="-L{runtime.tools.CMSIS-4.5.0.path}/CMSIS/Lib/GCC/" -larm_cortexM0l_math
 
 
 # Adafruit Metro M4 (SAMD51)