webkitgtk: Fix build on ppc with musl

(From OE-Core rev: b9659af922b336e6d41c1dd0aa0f13e6975cff7b)

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-sato/webkit/files/ppc-musl-fix.patch

@@ -0,0 +1,26 @@
+ucontext structure is different between musl and glibc for ppc
+therefore its not enough just to check for arch alone, we also
+need to check for libc type.
+
+Fixes errors like
+
+Source/JavaScriptCore/heap/MachineStackMarker.cpp:90:65: error: 'struct mcontext_t' has no member named 'uc_regs'; did you mean 'gregs'?
+     thread->suspendedMachineContext = *userContext->uc_mcontext.uc_regs;
+
+Upstream-Status: Pending
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Index: webkitgtk-2.12.3/Source/JavaScriptCore/heap/MachineStackMarker.cpp
+===================================================================
+--- webkitgtk-2.12.3.orig/Source/JavaScriptCore/heap/MachineStackMarker.cpp
++++ webkitgtk-2.12.3/Source/JavaScriptCore/heap/MachineStackMarker.cpp
+@@ -86,7 +86,7 @@ static void pthreadSignalHandlerSuspendR
+     }
+ 
+     ucontext_t* userContext = static_cast<ucontext_t*>(ucontext);
+-#if CPU(PPC)
++#if CPU(PPC) && defined(__GLIBC__)
+     thread->suspendedMachineContext = *userContext->uc_mcontext.uc_regs;
+ #else
+     thread->suspendedMachineContext = userContext->uc_mcontext;

meta/recipes-sato/webkit/webkitgtk_2.12.3.bb

@@ -17,6 +17,7 @@ SRC_URI = "\
   file://0001-OptionsGTK.cmake-drop-the-hardcoded-introspection-gt.patch \
   file://0001-WebKitMacros-Append-to-I-and-not-to-isystem.patch \
   file://musl-fixes.patch \
+  file://ppc-musl-fix.patch \
   "
 SRC_URI[md5sum] = "aebb4029c09dd81664aa830e4a584c85"
 SRC_URI[sha256sum] = "173cbb9a2eca23eee52e99965483ab25aa9c0569ef5b57041fc0c129cc26c307"