update eigen to 3.2.1
package agg: use mxe pkg mirror until project relocates
add requirements for gperf python ruby
add package gperf (for build-requirements)
silence deprecated target name warning for build-requirements
update package gcc
Merge pull request #388 from brad/eigen_bump

update eigen to 3.2.1
package crystalhd: use $(INSTALL) instead of mkdir
Merge branch 'master' of github.com:mxe/mxe
Move whitespace variables up to where all the other variables are

Signed-off-by: Timothy Gu <timothygu99@gmail.com>