mini-arm: 32-bit float operations aren't supported without FPU.

Author: Esme Povirk <esme@codeweavers.com>

---
--- a/mono/mini/mini-arm.h
+++ b/mono/mini/mini-arm.h
@@ -366,7 +366,11 @@ typedef struct MonoCompileArch {
 #define MONO_ARCH_HAVE_SDB_TRAMPOLINES 1
 #define MONO_ARCH_HAVE_PATCH_CODE_NEW 1
 #define MONO_ARCH_HAVE_OP_GENERIC_CLASS_INIT 1
+
+#ifndef MONO_ARCH_SOFT_FLOAT_FALLBACK
 #define MONO_ARCH_FLOAT32_SUPPORTED 1
+#endif
+
 #define MONO_ARCH_LLVM_TARGET_LAYOUT "e-p:32:32-n32-S64"
 
 #define MONO_ARCH_HAVE_INTERP_ENTRY_TRAMPOLINE 1