Add build defines for host os and fqbn (for debug purposes)

Author: me-no-dev

platform.txt

@@ -95,7 +95,7 @@ build.code_debug=0
 build.defines=
 build.loop_core=
 build.event_core=
-build.extra_flags=-DESP32 -DCORE_DEBUG_LEVEL={build.code_debug} {build.loop_core} {build.event_core} {build.defines} {build.extra_flags.{build.mcu}}
+build.extra_flags=-DARDUINO_HOST_OS="{runtime.os}" -DARDUINO_FQBN="{build.fqbn}" -DESP32 -DCORE_DEBUG_LEVEL={build.code_debug} {build.loop_core} {build.event_core} {build.defines} {build.extra_flags.{build.mcu}}
 build.extra_libs=
 build.memory_type={build.boot}_qspi