visualizationlibrary: Fix clang builds

mingw-w64-visualizationlibrary/0001-vl-remove-std-mem-fun-ref.patch

@@ -0,0 +1,14 @@
+--- a/src/external/tristripper/detail/graph_array.h
++++ b/src/external/tristripper/detail/graph_array.h
+@@ -444,7 +444,10 @@
+ template <class N>
+ inline void unmark_nodes(graph_array<N> & G)
+ {
+-  std::for_each(G.begin(), G.end(), std::mem_fun_ref(&graph_array<N>::node::unmark));
++  for (auto& node : G)
++  {
++    node.unmark();
++  }
+ }
+ 
+ 

mingw-w64-visualizationlibrary/PKGBUILD

@@ -16,14 +16,26 @@ makedepends=("${MINGW_PACKAGE_PREFIX}-cmake"
              "${MINGW_PACKAGE_PREFIX}-cc"
              'git')
 _commit='d2a0e321288152008957e29a0bc270ad192f75be'
-source=("${_realname}"::"git+https://github.com/MicBosi/VisualizationLibrary.git#commit=${_commit}")
-sha256sums=('SKIP')
+source=("${_realname}"::"git+https://github.com/MicBosi/VisualizationLibrary.git#commit=${_commit}"
+        0001-vl-remove-std-mem-fun-ref.patch)
+sha256sums=('SKIP'
+            '6f194c1103c94575be8269c3ba5affdf2f73a92a46a596244d1af2141d77bd90')
 
 pkgver() {
   cd "${_realname}"
   git describe --long --tags --abbrev=7 "${_commit}" | sed 's/\([^-]*-g\)/r\1/;s/-/./g;s/^v//g'
 }
 
+prepare() {
+  cd "${_realname}"
+
+  # for clang, due to cmath includes its own <version> headers
+  rm "src/external/libtiff/version"
+
+  # https://github.com/GPSnoopy/TriStripper/commit/79fd402a43a9e92aafc155f88ff53a0b044f1e81.patch
+  patch -p1 -i "${srcdir}/0001-vl-remove-std-mem-fun-ref.patch"
+}
+
 build() {
   declare -a _extra_config
   if check_option "debug" "n"; then