bdwgc: Include signal.h instead of hard asm/sigcontext.h

All cases are about glibc and for non-glibc systems it falls back to
last else choice which still is glibc's older version, ideally it
should have a case where libc != glibc

(From OE-Core rev: 3140a731d36adbf5be9f988f25653304ac86676e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/bdwgc/bdwgc/0001-fix-build-with-musl.patch

@@ -0,0 +1,35 @@
+From 829a89e7f5785239a9384e3afd46c900f9d76ada Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Mon, 31 Aug 2015 19:55:32 +0000
+Subject: [PATCH] fix build with musl
+
+signal.h already includes bits/sigcontext.h
+Documentation seems to indicate that if you need the definitions in
+sigcontext.h, you are supposed to include signal.h and not sigcontext.h.
+
+a good fix should be to remove glibc
+specific understanding, in those ifdef's
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ os_dep.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/os_dep.c b/os_dep.c
+index 08c501d..5cb7873 100644
+--- a/os_dep.c
++++ b/os_dep.c
+@@ -41,7 +41,7 @@
+ #   else /* __GLIBC__ < 2 */
+       /* libc5 doesn't have <sigcontext.h>: go directly with the kernel   */
+       /* one.  Check LINUX_VERSION_CODE to see which we should reference. */
+-#     include <asm/sigcontext.h>
++#     include <signal.h>
+ #   endif /* __GLIBC__ < 2 */
+ # endif
+ #endif /* LINUX && !POWERPC */
+-- 
+2.5.1
+

meta/recipes-support/bdwgc/bdwgc_7.4.2.bb

@@ -21,7 +21,9 @@ SECTION = "devel"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://README.QUICK;md5=55f5088f90a982fed7af9a4897047ef7"
 
-SRC_URI = "http://www.hboehm.info/gc/gc_source/gc-${PV}.tar.gz"
+SRC_URI = "http://www.hboehm.info/gc/gc_source/gc-${PV}.tar.gz \
+           file://0001-fix-build-with-musl.patch \
+          "
 
 SRC_URI[md5sum] = "12c05fd2811d989341d8c6d81f66af87"
 SRC_URI[sha256sum] = "63320ad7c45460e4a40e03f5aa4c6893783f21a16416c3282b994f933312afa2"