Revert "Add -MMD to c/cpp compiler flags to speed up compilation"

This reverts commit 346cdc0.

platform.txt

@@ -20,13 +20,13 @@ compiler.warning_flags.all=-Wall -Wextra
 
 compiler.path={runtime.tools.arm-none-eabi-gcc.path}/bin/
 compiler.c.cmd=arm-none-eabi-gcc
-compiler.c.flags=-c -g -Os {compiler.warning_flags} -ffunction-sections -fdata-sections -MMD
+compiler.c.flags=-c -g -Os {compiler.warning_flags} -ffunction-sections -fdata-sections
 compiler.cpp.elf.cmd=arm-none-eabi-g++
 compiler.c.elf.flags=-Os -Wl,--gc-sections
 compiler.S.cmd=arm-none-eabi-gcc
 compiler.S.flags=-c -g -x assembler-with-cpp
 compiler.cpp.cmd=arm-none-eabi-g++
-compiler.cpp.flags=-c -g -Os {compiler.warning_flags} -ffunction-sections -fdata-sections -fno-threadsafe-statics -fno-rtti -fno-exceptions -MMD
+compiler.cpp.flags=-c -g -Os {compiler.warning_flags} -ffunction-sections -fdata-sections -fno-threadsafe-statics -fno-rtti -fno-exceptions
 compiler.ar.cmd=arm-none-eabi-ar
 compiler.ar.flags=rcs
 compiler.objcopy.cmd=arm-none-eabi-objcopy