libmad: add Thumb2 patches from Debian

Fixes Thumb2-related build failure

Patch below comes from the Debian libmad package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

From: Dave Martin

Subject: "rsc" doesnt exist anymore in thumb2

diff --git a/fixed.h b/fixed.h

index 4b58abf..ba4bc26 100644

--- a/fixed.h

+++ b/fixed.h

@@ -275,12 +275,25 @@ mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)

 	 : "+r" (lo), "+r" (hi)  \

 	 : "%r" (x), "r" (y))

+#ifdef __thumb__

+/* In Thumb-2, the RSB-immediate instruction is only allowed with a zero

+	operand.  If needed this code can also support Thumb-1 

+	(simply append "s" to the end of the second two instructions). */

+#  define MAD_F_MLN(hi, lo)  \

+    asm ("rsbs        %0, %0, #0\n\t"  \

+	 "sbc   %1, %1, %1\n\t"  \

+	 "sub   %1, %1, %2"  \

+	 : "+&r" (lo), "=&r" (hi)  \

+	 : "r" (hi)  \

+	 : "cc")

+#else /* ! __thumb__ */

 #  define MAD_F_MLN(hi, lo)  \

     asm ("rsbs	%0, %2, #0\n\t"  \

 	 "rsc	%1, %3, #0"  \

-	 : "=r" (lo), "=r" (hi)  \

+	 : "=&r" (lo), "=r" (hi)  \

 	 : "0" (lo), "1" (hi)  \

 	 : "cc")

+#endif /* __thumb__ */

 #  define mad_f_scale64(hi, lo)  \

     ({ mad_fixed_t __result;  \

Fixes Thumb2 related build failure

Patch below comes from the Debian libmad package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

From: Konstantinos Margaritis <markos@debian.org>

Subject: use "adr" instead of "add" to make code ready for thumb2

--- ./imdct_l_arm.S.orig	2010-02-25 13:25:23.000000000 +0100

+++ ./imdct_l_arm.S	2010-02-25 13:27:26.000000000 +0100

@@ -468,7 +468,7 @@

     @----

-    add     r2, pc, #(imdct36_long_karray-.-8)  @ r2 = base address of Knn array (PIC safe ?)

+    adr     r2, imdct36_long_karray

 loop: