meson: ensure non-debug builds will use proper configuration

meson will set add -DHYPRLAND_DEBUG to CXXFLAGS during compilation of
debug builds. this avoids NDEBUG issues with wlroots and ensures asserts
will also work on release builds.

src/defines.hpp

@@ -7,10 +7,14 @@
 #include "wlrunstable/wlr_ext_workspace_v1.hpp"
 
 #ifndef NDEBUG
+#ifdef HYPRLAND_DEBUG
 #define ISDEBUG true
 #else
 #define ISDEBUG false
 #endif
+#else
+#define ISDEBUG false
+#endif
 
 #define RIP(format, ... ) { fprintf(stderr, format "\n", ##__VA_ARGS__); exit(EXIT_FAILURE); }