musl: Add bits/reg.h for riscv32

Applications include sys/reg.h to get wordsize for architecture and such
applications would fail to build on rv32/musl if this header is not
provided

Signed-off-by: Khem Raj <raj.khem@gmail.com>

recipes-core/musl/musl/0017-Add-bits-reg.h-for-riscv32.patch

@@ -0,0 +1,23 @@
+From 707914898f9b5a2738ad188942c3c730889f8f16 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Thu, 31 Dec 2020 16:07:38 -0800
+Subject: [PATCH] Add bits/reg.h for riscv32
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ arch/riscv32/bits/reg.h | 3 +++
+ 1 file changed, 3 insertions(+)
+ create mode 100644 arch/riscv32/bits/reg.h
+
+diff --git a/arch/riscv32/bits/reg.h b/arch/riscv32/bits/reg.h
+new file mode 100644
+index 00000000..0c7bffca
+--- /dev/null
++++ b/arch/riscv32/bits/reg.h
+@@ -0,0 +1,3 @@
++#undef __WORDSIZE
++#define __WORDSIZE 32
++/* FIXME */
+-- 
+2.30.0
+

recipes-core/musl/musl_%.bbappend

@@ -17,4 +17,5 @@ SRC_URI_append_riscv32 = "\
     file://0014-riscv32-Add-thread-support.patch \
     file://0015-Change-definitions-of-F_GETLK-F_SETLK-F_SETLKW.patch \
     file://0016-riscv32-Wire-new-syscalls.patch \
+    file://0017-Add-bits-reg.h-for-riscv32.patch \
 "