libsigc++: add upstream patch to fix building inkscape

Change-Id: I2a0ed10e49cf6033447f4c0892b2d137b8171ccf
neon: fix reverse hostname lookup test

Change-Id: I1e599f711d352c3989968c3ad596b4c605e9efe2
app-editors/vim-runmtime: enable syntax highlighting as default

Change-Id: I3aefbdd8c9c16665b34556457d286cfe62fe383d