update broken PKG_UPDATE rules, handle missing update rules * Makefile.in: add handling for packages with no update rule * src/gtk2.mk, src/gtk3.mk, src/libvpx.mk, src/taglib.mk, src/hunspell.mk, src/vala.mk : use github tags for version info * src/llvm.mk: add '?' to update url * src/openscenegraph.mk: update SED rule for version extraction * src/pthread-stubs.mk, src/qt5.mk, src/renderproto.mk, src/sm.mk, src/s2tc.mk, src/util-macros.mk: added dummy PKG_UPDATE rule * src/qscintilla.mk: change search name for version extraction * src/qtbase.mk: use short pkg version in update path * src/suitesparse.mk: update change in main url/version url * src/tre.mk: update download page link * src/vmime.mk: update download and update url * src/wget.mk, src/xapian-core.mk: update url, sed rule * src/wt.mk: update to use github download/update * src/src-msys-libcrypt.mk: update sed rule

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Make sure exec_prefix is defined in wavpack.pc.

diff -ur a/wavpack.pc.in b/wavpack.pc.in
--- a/wavpack.pc.in	2013-09-29 23:30:14.000000000 +0200
+++ b/wavpack.pc.in	2013-11-17 18:31:35.351567596 +0100
@@ -1,4 +1,5 @@
 prefix=@prefix@
+exec_prefix=${prefix}
 libdir=@libdir@
 includedir=${prefix}/include