Handle PSRAM libs in PlatformIO build script (#4911)

This PR adds PSRAM-specific libraries to the final linker command depending on the `BOARD_HAS_PSRAM` macro.

cc @me-no-dev

tools/platformio-build.py

@@ -187,6 +187,14 @@ env.Append(
 if not env.BoardConfig().get("build.ldscript", ""):
     env.Replace(LDSCRIPT_PATH=env.BoardConfig().get("build.arduino.ldscript", ""))
 
+#
+# Add PSRAM-specific libraries
+#
+
+flatten_cppdefines = env.Flatten(env["CPPDEFINES"])
+if "BOARD_HAS_PSRAM" in flatten_cppdefines:
+    env.Append(LIBS=["c-psram-workaround", "m-psram-workaround"])
+
 #
 # Target: Build Core Library
 #