Add support for aarch64_be, or1k and microblazebe.

Fixes #73.
diff --git a/double-conversion/utils.h b/double-conversion/utils.h
index 98a2a11..492bc97 100644
--- a/double-conversion/utils.h
+++ b/double-conversion/utils.h
@@ -76,8 +76,9 @@
     defined(__sparc__) || defined(__sparc) || defined(__s390__) || \
     defined(__SH4__) || defined(__alpha__) || \
     defined(_MIPS_ARCH_MIPS32R2) || \
-    defined(__AARCH64EL__) || defined(__aarch64__) || \
-    defined(__riscv)
+    defined(__AARCH64EL__) || defined(__aarch64__) || defined(__AARCH64EB__) || \
+    defined(__riscv) || \
+    defined(__or1k__)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(__mc68000__) || \
     defined(__pnacl__) || defined(__native_client__)