nanovg: disable some compiler warnings

Disable all warnings seen on devkitA64 GCC 15.1.0:

- Several false-positive `-Wmisleading-indentation` warnings (the
  indentation is not actually misleading)

- One `-Wuse-after-free` warning, which looks alarming and represents
  very dubious design, but is ultimately harmless (a freed pointer is
  passed to a function that doesn't use it).

- Some `-Wunused-function` warnings in `simd/neon.h`

libraries/libvapours/include/vapours/includes.hpp

@@ -44,8 +44,9 @@
 #include <bit>
 #include <span>
 
-/* Stratosphere wants additional libstdc++ headers, others do not. */
-#ifdef ATMOSPHERE_IS_STRATOSPHERE
+/* Stratosphere/Troposphere want additional libstdc++ headers and libnx,
+ * others do not. */
+#if defined(ATMOSPHERE_IS_STRATOSPHERE) || defined(ATMOSPHERE_IS_TROPOSPHERE)
 
 #include <memory>
 #include <mutex>
@@ -71,7 +72,7 @@
 /* Non-EL0 code can't include libnx. */
 #include "types.hpp"
 
-#endif /* ATMOSPHERE_IS_STRATOSPHERE */
+#endif /* defined(ATMOSPHERE_IS_STRATOSPHERE) || defined(ATMOSPHERE_IS_TROPOSPHERE) */
 
 /* Atmosphere meta. */
 #include <vapours/ams_version.h>

troposphere/daybreak/nanovg/Makefile

@@ -50,6 +50,8 @@ ARCH	:=	-march=armv8-a+crc+crypto -mtune=cortex-a57 -mtp=soft -fPIE
 CFLAGS	:=	-g -Wall -O2 -ffunction-sections \
 			$(ARCH) $(DEFINES)
 
+CFLAGS	+=	-Wno-misleading-indentation -Wno-use-after-free -Wno-unused-function
+
 CFLAGS	+=	$(INCLUDE) -D__SWITCH__
 
 CXXFLAGS	:= $(CFLAGS) -std=gnu++17 -fno-exceptions -fno-rtti

troposphere/daybreak/source/ui.cpp

@@ -1277,7 +1277,7 @@ namespace dbk {
         if (InitializeMenu(screen_width, screen_height)) {
 
             /* Set the update path. */
-            strncpy(g_update_path, update_path, sizeof(g_update_path));
+            strncpy(g_update_path, update_path, sizeof(g_update_path)-1);
 
             /* Change the menu. */
             ChangeMenu(std::make_shared<ValidateUpdateMenu>(g_current_menu));

troposphere/haze/include/haze/common.hpp

@@ -15,7 +15,9 @@
  */
 #pragma once
 
+#define ATMOSPHERE_IS_TROPOSPHERE
 #define ATMOSPHERE_OS_HORIZON
+#define ATMOSPHERE_BOARD_NINTENDO_NX
 #define ATMOSPHERE_ARCH_ARM64
 #define ATMOSPHERE_ARCH_ARM_V8A