Add libdca

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
package wavpack: add missing exec_prefix in wavpack.pc

I get a build error in the xine-lib package after the latest wavpack
update because exec_prefix is not defined in wavpack.pc.
package boost: fix WinError capitalization
update package hdf5
update package wt
package openscenegraph: only update to stable releases
update package imagemagick
update package poco
package libnut: fix update placeholder
package sdl_ttf: ignore future 2x series updates
Merge pull request #273 from TimothyGu/dca

Add libdca
package libdca: fix update placeholder
Merge branch 'master' of https://github.com/mxe/mxe
pkg lapack: checksum has changed