Add big endian ARM support (#92)

This fixes compilation on such platforms.
diff --git a/double-conversion/utils.h b/double-conversion/utils.h
index 47489f6..7c10d3f 100644
--- a/double-conversion/utils.h
+++ b/double-conversion/utils.h
@@ -91,7 +91,7 @@
     defined(_POWER) || defined(_ARCH_PPC) || defined(_ARCH_PPC64) || \
     defined(__sparc__) || defined(__sparc) || defined(__s390__) || \
     defined(__SH4__) || defined(__alpha__) || \
-    defined(_MIPS_ARCH_MIPS32R2) || \
+    defined(_MIPS_ARCH_MIPS32R2) || defined(__ARMEB__) ||\
     defined(__AARCH64EL__) || defined(__aarch64__) || defined(__AARCH64EB__) || \
     defined(__riscv) || \
     defined(__or1k__) || defined(__arc__) || \