ARM assembler pack: add missing arm_arch.h.

crypto/arm_arch.h

+#ifndef __ARM_ARCH_H__
+#define __ARM_ARCH_H__
+
+#if !defined(__ARM_ARCH__)
+# if defined(__CC_ARM)
+#  define __ARM_ARCH__ __TARGET_ARCH_ARM
+#  if defined(__BIG_ENDIAN)
+#   define __ARMEB__
+#  else
+#   define __ARMEL__
+#  endif
+# elif defined(__GNUC__)
+  /*
+   * Why doesn't gcc define __ARM_ARCH__? Instead it defines
+   * bunch of below macros. See all_architectires[] table in
+   * gcc/config/arm/arm.c. On a side note it defines
+   * __ARMEL__/__ARMEB__ for little-/big-endian.
+   */
+#  if	defined(__ARM_ARCH_7__)	|| defined(__ARM_ARCH_7A__)	|| \
+	defined(__ARM_ARCH_7R__)|| defined(__ARM_ARCH_7M__)	|| \
+	defined(__ARM_ARCH_7EM)
+#   define __ARM_ARCH__ 7
+#  elif	defined(__ARM_ARCH_6__)	|| defined(__ARM_ARCH_6J__)	|| \
+	defined(__ARM_ARCH_6K__)|| defined(__ARM_ARCH_6M__)	|| \
+	defined(__ARM_ARCH_6Z__)|| defined(__ARM_ARCH_6ZK__)	|| \
+	defined(__ARM_ARCH_6T2__)
+#   define __ARM_ARCH__ 6
+#  elif	defined(__ARM_ARCH_5__)	|| defined(__ARM_ARCH_5T__)	|| \
+	defined(__ARM_ARCH_5E__)|| defined(__ARM_ARCH_5TE__)
+#   define __ARM_ARCH__ 5
+#  elif	defined(__ARM_ARCH_4__)	|| defined(__ARM_ARCH_4T__)
+#   define __ARM_ARCH__ 4
+#  else
+#   error "unsupported ARM architecture"
+#  endif
+# endif
+
+#endif
+#endif