www/webkit2-gtk3: fix build on powerpc64

ar is now required for build.

Include ExecutableBaseInlines.h in NativeExecutable.cpp to fix:
Source/JavaScriptCore/CMakeFiles/JavaScriptCore.dir/__/__/DerivedSources/JavaScriptCore/unified-sources/UnifiedSource-f2e18ffc-27.cpp.o(.text+0x5300): error: undefined reference to 'JSC::ExecutableBase::hasJITCodeForCall() const'

www/webkit2-gtk3/Makefile

@@ -15,6 +15,7 @@ COMMENT=	Opensource browser engine using the GTK+ 3 toolkit
 LICENSE=	GPLv2 BSD2CLAUSE
 LICENSE_COMB=	dual
 
+BUILD_DEPENDS=	${LOCALBASE}/bin/ar:devel/binutils
 LIB_DEPENDS=	libenchant-2.so:textproc/enchant2 \
 		libfribidi.so:converters/fribidi \
 		libfontconfig.so:x11-fonts/fontconfig \

www/webkit2-gtk3/files/patch-Source_JavaScriptCore_runtime_NativeExecutable.cpp

@@ -0,0 +1,10 @@
+--- Source/JavaScriptCore/runtime/NativeExecutable.cpp.orig	2021-02-15 20:45:27 UTC
++++ Source/JavaScriptCore/runtime/NativeExecutable.cpp
+@@ -24,6 +24,7 @@
+  */
+ 
+ #include "config.h"
++#include "ExecutableBaseInlines.h"
+ #include "NativeExecutable.h"
+ 
+ #include "JSCInlines.h"