Avoid `Arduino.h` if its features are disabled (fixes #1692)

Created by: paulocsanz

Fixes #1692 (closed)

It's not clear if this is the best solution. I'm open to suggestions and will modify the PR accordingly.

src/ArduinoJson/Configuration.hpp

@@ -116,8 +116,6 @@
 
 #ifdef ARDUINO
 
-#  include <Arduino.h>
-
 // Enable support for Arduino's String class
 #  ifndef ARDUINOJSON_ENABLE_ARDUINO_STRING
 #    define ARDUINOJSON_ENABLE_ARDUINO_STRING 1
@@ -133,6 +131,11 @@
 #    define ARDUINOJSON_ENABLE_ARDUINO_PRINT 1
 #  endif
 
+#  if ARDUINOJSON_ENABLE_ARDUINO_STRING || \
+      ARDUINO_JSON_ENABLE_ARDUINO_STREAM || ARDUINOJSON_ENABLE_ARDUINO_PRINT
+#    include <Arduino.h>
+#  endif
+
 #else  // ARDUINO
 
 // Disable support for Arduino's String class
@@ -153,6 +156,9 @@
 #endif  // ARDUINO
 
 #ifndef ARDUINOJSON_ENABLE_PROGMEM
+#  ifdef ARDUINO
+#    include <Arduino.h>
+#  endif
 #  if defined(PROGMEM) && defined(pgm_read_byte) && defined(pgm_read_dword) && \
       defined(pgm_read_ptr) && defined(pgm_read_float)
 #    define ARDUINOJSON_ENABLE_PROGMEM 1
@@ -161,6 +167,10 @@
 #  endif
 #endif
 
+#if defined(ARDUINO) && ARDUINOJSON_ENABLE_PROGMEM
+#  include <Arduino.h>
+#endif
+
 // Convert unicode escape sequence (\u0123) to UTF-8
 #ifndef ARDUINOJSON_DECODE_UNICODE
 #  define ARDUINOJSON_DECODE_UNICODE 1