src: Add #if defined() macros to support Linux and MacOS

Author: bxparks

src/ace_routine/Flash.h

@@ -55,6 +55,8 @@ class __FlashStringHelper;
   #include <avr/pgmspace.h>
 #elif defined(ESP8266) || defined(ESP32)
   #include <pgmspace.h>
+#elif defined(__linux__) || defined(__APPLE__)
+  #include <pgmspace.h>
 #else
   #error Unsupported platform
 #endif
@@ -63,6 +65,8 @@ class __FlashStringHelper;
   #define ACE_ROUTINE_F(x) F(x)
 #elif defined(ESP8266) || defined(ESP32) || defined(__arm__)
   #define ACE_ROUTINE_F(x) ACE_ROUTINE_FPSTR(x)
+#elif defined(__linux__) || defined(__APPLE__)
+  #define ACE_ROUTINE_F(x) ACE_ROUTINE_FPSTR(x)
 #else
   #error Unsupported platform
 #endif