add compiler directive for no-include-next in both build_flags and build_src_flags

platformio.ini

@@ -23,7 +23,7 @@ build_flags =
     -D CCACHE_ENABLE=1
     ; Treats ESP-IDF libc extensions headers as system headers to suppress external warnings
     ; -isystem /home/tom/.platformio/packages/framework-espidf/components/esp_libc/platform_include
-
+    -Wno-include-next
 ; --- STRICT MODE FOR PROJECT APPLICATION CODE ONLY ---
 ; These flags are strictly applied ONLY to C++ files inside the src/ directory.
 build_src_flags =
@@ -39,5 +39,7 @@ build_src_flags =
     -Wconversion
     ; Warns if a local variable shadows another variable in scope
     -Wshadow
+
+    -Wno-include-next
     ; Promotes all warnings to hard compilation errors to guarantee clean code
     ;-Werror