fix(arduino): Move extra_flags to flags (#10493)

This will help external library developers

Author: me-no-dev

platform.txt

@@ -50,10 +50,10 @@ compiler.common_werror_flags=-Werror=return-type
 
 # Compile Flags
 compiler.cpreprocessor.flags="@{compiler.sdk.path}/flags/defines" "-I{build.source.path}" -iprefix "{compiler.sdk.path}/include/" "@{compiler.sdk.path}/flags/includes" "-I{compiler.sdk.path}/{build.memory_type}/include"
-compiler.c.flags="@{compiler.sdk.path}/flags/c_flags" {compiler.warning_flags} {compiler.optimization_flags} {compiler.common_werror_flags}
-compiler.cpp.flags="@{compiler.sdk.path}/flags/cpp_flags" {compiler.warning_flags} {compiler.optimization_flags} {compiler.common_werror_flags}
-compiler.S.flags="@{compiler.sdk.path}/flags/S_flags" {compiler.warning_flags} {compiler.optimization_flags}
-compiler.c.elf.flags="@{compiler.sdk.path}/flags/ld_flags" "@{compiler.sdk.path}/flags/ld_scripts"
+compiler.c.flags=-MMD -c "@{compiler.sdk.path}/flags/c_flags" {compiler.warning_flags} {compiler.optimization_flags} {compiler.common_werror_flags}
+compiler.cpp.flags=-MMD -c "@{compiler.sdk.path}/flags/cpp_flags" {compiler.warning_flags} {compiler.optimization_flags} {compiler.common_werror_flags}
+compiler.S.flags=-MMD -c -x assembler-with-cpp "@{compiler.sdk.path}/flags/S_flags" {compiler.warning_flags} {compiler.optimization_flags}
+compiler.c.elf.flags="-Wl,--Map={build.path}/{build.project_name}.map" "-L{compiler.sdk.path}/lib" "-L{compiler.sdk.path}/ld" "-L{compiler.sdk.path}/{build.memory_type}" "-Wl,--wrap=esp_panic_handler" "@{compiler.sdk.path}/flags/ld_flags" "@{compiler.sdk.path}/flags/ld_scripts"
 compiler.c.elf.libs="@{compiler.sdk.path}/flags/ld_libs"
 compiler.ar.flags=cr
 
@@ -67,10 +67,10 @@ compiler.ar.cmd={compiler.prefix}gcc-ar
 compiler.size.cmd={compiler.prefix}size
 
 # These can be overridden in platform.local.txt
-compiler.c.extra_flags=-MMD -c
-compiler.cpp.extra_flags=-MMD -c
-compiler.S.extra_flags=-MMD -c -x assembler-with-cpp
-compiler.c.elf.extra_flags="-Wl,--Map={build.path}/{build.project_name}.map" "-L{compiler.sdk.path}/lib" "-L{compiler.sdk.path}/ld" "-L{compiler.sdk.path}/{build.memory_type}" "-Wl,--wrap=esp_panic_handler"
+compiler.c.extra_flags=
+compiler.cpp.extra_flags=
+compiler.S.extra_flags=
+compiler.c.elf.extra_flags=
 compiler.ar.extra_flags=
 compiler.objcopy.eep.extra_flags=
 compiler.elf2hex.extra_flags=