package/musl: fix conflict with riscv kernel headers

Add two upstream patches fixing musl vs kernel headers conflict. This
fixes build of strace for risc64 at it happens to use headers from both
sources.

Modify patch #3 to leave a single newline in user.h. Otherwise 'patch
-E' in apply-patches.sh deletes user.h instead of leaving it empty.

Fixes (strace):
http://autobuild.buildroot.net/results/ac32e83dc5eb5ce2809fc4b9d11f540dbdae9ed6/

Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/musl/0002-fix-risc64-conflict-with-kernel-headers.patch

@@ -0,0 +1,61 @@
+From 8acc688548b27151c45ee8a80f3a0b75f4a761c0 Mon Sep 17 00:00:00 2001
+From: Baruch Siach <baruch@tkos.co.il>
+Date: Tue, 6 Aug 2019 08:51:13 +0300
+Subject: [PATCH] fix risc64 conflict with kernel headers
+
+Rename user registers struct definitions to avoid conflict with the
+asm/ptrace.h kernel header that defines the same structs. Use the
+__riscv_mc prefix as glibc does.
+
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Upstream status: commit 8acc688548b
+
+ arch/riscv64/bits/signal.h | 16 ++++++++--------
+ 1 file changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/arch/riscv64/bits/signal.h b/arch/riscv64/bits/signal.h
+index 4c94a8f02edc..76d7ad80c8cd 100644
+--- a/arch/riscv64/bits/signal.h
++++ b/arch/riscv64/bits/signal.h
+@@ -12,29 +12,29 @@
+ typedef unsigned long greg_t;
+ typedef unsigned long gregset_t[32];
+ 
+-struct __riscv_f_ext_state {
++struct __riscv_mc_f_ext_state {
+ 	unsigned int f[32];
+ 	unsigned int fcsr;
+ };
+ 
+-struct __riscv_d_ext_state {
++struct __riscv_mc_d_ext_state {
+ 	unsigned long long f[32];
+ 	unsigned int fcsr;
+ };
+ 
+-struct __riscv_q_ext_state {
++struct __riscv_mc_q_ext_state {
+ 	unsigned long long f[64] __attribute__((aligned(16)));
+ 	unsigned int fcsr;
+ 	unsigned int reserved[3];
+ };
+ 
+-union __riscv_fp_state {
+-	struct __riscv_f_ext_state f;
+-	struct __riscv_d_ext_state d;
+-	struct __riscv_q_ext_state q;
++union __riscv_mc_fp_state {
++	struct __riscv_mc_f_ext_state f;
++	struct __riscv_mc_d_ext_state d;
++	struct __riscv_mc_q_ext_state q;
+ };
+ 
+-typedef union __riscv_fp_state fpregset_t;
++typedef union __riscv_mc_fp_state fpregset_t;
+ 
+ typedef struct sigcontext {
+ 	gregset_t gregs;
+-- 
+2.20.1
+

package/musl/0003-remove-riscv64-bits-user.h-contents.patch

@@ -0,0 +1,69 @@
+From 414b512c60706e34473edd58fe876037ea77138c Mon Sep 17 00:00:00 2001
+From: Rich Felker <dalias@aerifal.cx>
+Date: Tue, 6 Aug 2019 12:50:38 -0400
+Subject: [PATCH] remove riscv64 bits/user.h contents
+
+the contents conflicted with asm/ptrace.h. glibc does not provide
+anything in user.h for riscv, so software cannot be depending on it.
+
+simplified from patch submitted by Baruch Siach.
+
+[ baruch: add empty line so that 'patch -E' doesn't delete user.h ]
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Upstream status: commit d493206de7df
+
+ arch/riscv64/bits/user.h | 42 ----------------------------------------
+ 1 file changed, 42 deletions(-)
+
+diff --git a/arch/riscv64/bits/user.h b/arch/riscv64/bits/user.h
+index bd0f0fc7027f..8b137891791f 100644
+--- a/arch/riscv64/bits/user.h
++++ b/arch/riscv64/bits/user.h
+@@ -1,43 +1 @@
+-struct user_regs_struct {
+-	unsigned long pc;
+-	unsigned long ra;
+-	unsigned long sp;
+-	unsigned long gp;
+-	unsigned long tp;
+-	unsigned long t0;
+-	unsigned long t1;
+-	unsigned long t2;
+-	unsigned long s0;
+-	unsigned long s1;
+-	unsigned long a0;
+-	unsigned long a1;
+-	unsigned long a2;
+-	unsigned long a3;
+-	unsigned long a4;
+-	unsigned long a5;
+-	unsigned long a6;
+-	unsigned long a7;
+-	unsigned long s2;
+-	unsigned long s3;
+-	unsigned long s4;
+-	unsigned long s5;
+-	unsigned long s6;
+-	unsigned long s7;
+-	unsigned long s8;
+-	unsigned long s9;
+-	unsigned long s10;
+-	unsigned long s11;
+-	unsigned long t3;
+-	unsigned long t4;
+-	unsigned long t5;
+-	unsigned long t6;
+-};
+ 
+-struct user_fpregs_struct {
+-	double f[32];
+-	unsigned int fcsr;
+-};
+-
+-#define ELF_NGREG 32
+-typedef unsigned long elf_greg_t, elf_gregset_t[ELF_NGREG];
+-typedef struct user_fpregs_struct elf_fpregset_t;
+-- 
+2.20.1
+