gnu: sbc: Fix build on non-x86 architectures.

* gnu/packages/patches/sbc-fix-build-non-x86.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/linux.scm (sbc)[source](patches): New field.

gnu/local.mk

@@ -1600,6 +1600,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/rust-reproducible-builds.patch		 \
   %D%/packages/patches/rust-openssl-sys-no-vendor.patch	\
   %D%/packages/patches/rxvt-unicode-escape-sequences.patch	\
+  %D%/packages/patches/sbc-fix-build-non-x86.patch		\
   %D%/packages/patches/sbcl-clml-fix-types.patch		\
   %D%/packages/patches/scalapack-blacs-mpi-deprecations.patch	\
   %D%/packages/patches/scheme48-tests.patch			\

gnu/packages/linux.scm

@@ -4654,6 +4654,7 @@ event traces from the kernel (via the relaying through the debug file system).")
               (method url-fetch)
               (uri (string-append "mirror://kernel.org/linux/bluetooth/sbc-"
                                   version ".tar.xz"))
+              (patches (search-patches "sbc-fix-build-non-x86.patch"))
               (sha256
                (base32
                 "1liig5856crb331dps18mp0s13zbkv7yh007zqhq97m94fcddfhc"))))

gnu/packages/patches/sbc-fix-build-non-x86.patch

@@ -0,0 +1,17 @@
+Don't refer to x86-specific function on other architectures to avoid linker error.
+
+Submitted upstream at <https://marc.info/?l=linux-bluetooth&m=160857625608440&w=2>
+
+diff --git a/sbc/sbc_primitives.c b/sbc/sbc_primitives.c
+--- a/sbc/sbc_primitives.c
++++ b/sbc/sbc_primitives.c
+@@ -593,7 +593,9 @@ static int sbc_calc_scalefactors_j(
+ 
+ static void sbc_init_primitives_x86(struct sbc_encoder_state *state)
+ {
++#if defined(__x86_64__) || defined(__i386__)
+ 	__builtin_cpu_init();
++#endif
+ 
+ #ifdef SBC_BUILD_WITH_MMX_SUPPORT
+ 	if (__builtin_cpu_supports("mmx"))