fix(build): Remove unnecessary CFLAGS

Signed-off-by: Rahix <rahix@rahix.de>

card10-cross.ini

@@ -4,7 +4,7 @@ ar = 'arm-none-eabi-ar'
 strip = 'arm-none-eabi-strip'
 
 [properties]
-c_args      = ['-mthumb', '-mcpu=cortex-m4', '-mfloat-abi=hard', '-mfpu=fpv4-sp-d16', '-Wa,-mimplicit-it=thumb', '-ffunction-sections', '-fdata-sections', '-fsingle-precision-constant', '-fno-isolate-erroneous-paths-dereference', '-Wl,--start-group', '-lc', '-lnosys', '-Wl,--end-group']
+c_args      = ['-mthumb', '-mcpu=cortex-m4', '-mfloat-abi=hard', '-mfpu=fpv4-sp-d16', '-Wa,-mimplicit-it=thumb', '-ffunction-sections', '-fdata-sections', '-fsingle-precision-constant', '-fno-isolate-erroneous-paths-dereference']
 
 c_link_args = ['-mthumb', '-mcpu=cortex-m4', '-mfloat-abi=hard', '-mfpu=fpv4-sp-d16', '-Wl,--start-group', '-lc', '-lnosys', '-Wl,--end-group', '--specs=nano.specs', '-u _printf_float']