qt: add workaround for moc parsing bug

The moc-qt4 parser fails to recognize the redefinition of some
macros like major(), minor() in the new version of the
kernel-libc-headers-4.9.8 file sys/sysmacros.h.
Add a patch to predefine the macro _SYS_SYSMACROS_H_OUTER
which works around this bug and makes it possible again to
build qt-webkit and possibly other packages depending on qt.

srcpkgs/qt/patches/moc-syslib-workaround.patch

@@ -0,0 +1,11 @@
+--- qt-everywhere-opensource-src-4.8.7/src/tools/moc/main.cpp	2017-02-20 18:21:15.826212874 +0100
++++ qt-everywhere-opensource-src-4.8.7/src/tools/moc/main.cpp	2017-02-20 18:23:02.448342205 +0100
+@@ -192,6 +192,8 @@
+     pp.macros["BOOST_TT_HAS_OPERATOR_HPP_INCLUDED"];
+     pp.macros["BOOST_LEXICAL_CAST_INCLUDED"];
+     pp.macros["BOOST_NEXT_PRIOR_HPP_INCLUDED"];
++    // Workaround a bug where newer kernel-libc-headers sys/sysmacros.h define macros like major, minor
++    pp.macros["_SYS_SYSMACROS_H_OUTER"];
+ 
+     QByteArray filename;
+     QByteArray output;

srcpkgs/qt/template

@@ -1,7 +1,7 @@
 # Template file for 'qt'
 pkgname=qt
 version=4.8.7
-revision=18
+revision=19
 _distname=qt-everywhere-opensource-src
 patch_args="-Np1"
 wrksrc=${_distname}-${version}