Clarify debug/release decisions

triggered by trying to build "Release" mode in xcode -- which either defines or doesn't define DEBUG

Diffs=
8d6da9a32 Clarify debug/release for xcode

.rive_head

diff --git a/.rive_head b/.rive_head
index dd757ab..59fd6b2 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-1f9ff75d9c216c4418ab0e282b3501b2592e1e45
+8d6da9a325e1d11d61fa1bede1e5360ff5df95ae

include/rive/rive_types.hpp

diff --git a/include/rive/rive_types.hpp b/include/rive/rive_types.hpp
index 292a64f..9624bb0 100644
--- a/include/rive/rive_types.hpp
+++ b/include/rive/rive_types.hpp
@@ -9,41 +9,40 @@
 #ifndef _RIVE_TYPES_HPP_
 #define _RIVE_TYPES_HPP_
 
-// We treat NDEBUG is the root of truth from the user.
-// Our other symbols (DEBUG, RELEASE) must agree with it.
-// ... its ok if our client doesn't set these, we will do that...
-// ... they just can't set them inconsistently.
+// clang-format off
+
+#if defined(DEBUG) && defined(NDEBUG)
+    #error "can't determine if we're debug or release"
+#endif
+
+#if !defined(DEBUG) && !defined(NDEBUG)
+    // we have to make a decision what mode we're in
+    // xcode seems to be in Release mode in this case ...
+    #define NDEBUG  1
+#endif
 
 #ifdef NDEBUG
-// we're in release mode
-#ifdef DEBUG
-#error "can't define both DEBUG and NDEBUG"
-#endif
-#ifndef RELEASE
-#define RELEASE
-#endif
-#else
-// we're in debug mode
-#ifdef RELEASE
-#error "can't define RELEASE and not NDEBUG"
-#endif
-#ifndef DEBUG
-#define DEBUG
-#endif
+    #ifndef RELEASE
+        #define RELEASE 1
+    #endif
+#else   // debug mode
+    #ifndef DEBUG
+        #define DEBUG   1
+    #endif
 #endif
 
 // Some checks to guess what platform we're building for
 
 #ifdef __APPLE__
 
-#define RIVE_BUILD_FOR_APPLE
-#include <TargetConditionals.h>
+    #define RIVE_BUILD_FOR_APPLE
+    #include <TargetConditionals.h>
 
-#if TARGET_OS_IPHONE
-#define RIVE_BUILD_FOR_IOS
-#elif TARGET_OS_MAC
-#define RIVE_BUILD_FOR_OSX
-#endif
+    #if TARGET_OS_IPHONE
+        #define RIVE_BUILD_FOR_IOS
+    #elif TARGET_OS_MAC
+        #define RIVE_BUILD_FOR_OSX
+    #endif
 
 #endif
 
@@ -58,13 +57,13 @@
 
 // Annotations to assert unreachable control flow.
 #ifdef __GNUC__ // GCC 4.8+, Clang, Intel and others compatible with GCC (-std=c++0x or above)
-#define RIVE_UNREACHABLE __builtin_unreachable()
+    #define RIVE_UNREACHABLE __builtin_unreachable()
 #elif _MSC_VER
-#define RIVE_UNREACHABLE __assume(0)
+    #define RIVE_UNREACHABLE __assume(0)
 #else
-#define RIVE_UNREACHABLE                                                                           \
-    do {                                                                                           \
-    } while (0)
+    #define RIVE_UNREACHABLE do {} while(0)
 #endif
 
+// clang-format on
+
 #endif // rive_types