firefox: add preliminary ppc32 build fix

srcpkgs/firefox/patches/ppc32-fix-build.patch

@@ -0,0 +1,36 @@
+This is not a complete/correct patch, but it makes firefox build. For now
+mostly for tracking, so a real fix can be made, but right now it still
+segfaults on start.
+
+Ref: https://hg.mozilla.org/mozilla-central/rev/08339a56f3ae
+Ref: https://hg.mozilla.org/mozilla-central/rev/d16fcad6aa60
+Ref: https://hg.mozilla.org/mozilla-central/rev/ab87611d012e
+Ref: https://hg.mozilla.org/mozilla-central/file/tip/xpcom/reflect/xptcall/md/unix/xptcinvoke_ppc_linux.cpp
+
+--- xpcom/reflect/xptcall/xptcall.h
++++ xpcom/reflect/xptcall/xptcall.h
+@@ -71,6 +71,11 @@ struct nsXPTCVariant {
+     ExtendedVal ext;
+   };
+ 
++#if defined(__powerpc__) && !defined(__powerpc64__)
++  // this field is still necessary on ppc32, as an address
++  // to it is taken certain places in xptcall
++  void *ptr;
++#endif
+   nsXPTType type;
+   uint8_t flags;
+ 
+@@ -91,7 +96,12 @@ struct nsXPTCVariant {
+   };
+ 
+   void ClearFlags() { flags = 0; }
++#if defined(__powerpc__) && !defined(__powerpc64__)
++  void SetIndirect() { ptr = &val; flags |= IS_INDIRECT; }
++  bool IsPtrData() const { return IsIndirect(); }
++#else
+   void SetIndirect() { flags |= IS_INDIRECT; }
++#endif
+ 
+   bool IsIndirect() const { return 0 != (flags & IS_INDIRECT); }
+