Core: Truncate preloading ROMs that slightly exceed max size (fixes #2093)

CHANGES

@@ -9,6 +9,7 @@ Other fixes:
  - GBA e-Reader: Fix bitmap short strip scanning
  - GBA Video: Fix mode 5 frame 1 caching (fixes mgba.io/i/2075)
 Misc:
+ - Core: Truncate preloading ROMs that slightly exceed max size (fixes mgba.io/i/2093)
  - GBA: Default-enable VBA bug compat for Ruby and Emerald ROM hacks
  - Qt: Add ROM filename and size to bug reporter
 

src/core/core.c

@@ -159,7 +159,13 @@ bool mCorePreloadVFCB(struct mCore* core, struct VFile* vf, void (cb)(size_t, si
 	extern uint32_t* romBuffer;
 	extern size_t romBufferSize;
 	if (size > romBufferSize) {
-		return false;
+		if (size - romBufferSize < romBufferSize / 2) {
+			// Some ROM hacks accidentally overflow the size a bit, but since those are broken
+			// on hardware anyway we can just silently truncate them without issue.
+			size = romBufferSize;
+		} else {
+			return false;
+		}
 	}
 	vfm = VFileFromMemory(romBuffer, size);
 #else