Drop unneeded %-prefix on ARM register.

ChangeLog

+2015-04-29  Niels Möller  <nisse@lysator.liu.se>
+
+	* arm/v6/aes-decrypt-internal.asm: Drop %-prefix on r12 register.
+	* arm/v6/aes-encrypt-internal.asm: Likewise.
+
 2015-04-24  Niels Möller  <nisse@lysator.liu.se>
 
 	* Released nettle-3.1.1.

arm/v6/aes-decrypt-internal.asm

@@ -59,7 +59,7 @@ C 8 saved registers
 define(<FRAME_DST>,  <[sp, #+40]>)
 define(<FRAME_SRC>,  <[sp, #+44]>)
 
-define(<SRC>, <%r12>)	C Overlap registers used in inner loop.
+define(<SRC>, <r12>)	C Overlap registers used in inner loop.
 define(<DST>, <COUNT>)
 
 C AES_DECRYPT_ROUND(x0,x1,x2,x3,w0,w1,w2,w3,key)

arm/v6/aes-encrypt-internal.asm

@@ -65,7 +65,7 @@ C 8 saved registers
 define(<FRAME_DST>,  <[sp, #+40]>)
 define(<FRAME_SRC>,  <[sp, #+44]>)
 
-define(<SRC>, <%r12>)	C Overlap registers used in inner loop.
+define(<SRC>, <r12>)	C Overlap registers used in inner loop.
 define(<DST>, <COUNT>)
 
 C 53 instr.