Fix bz2.rb to solve several problems

update libxml2 to 2.9.4

Update libssh2 to 1.8.0

Update curl to 7.54.0

Update expat to 2.2.0

change method names to conform to ruby style guidelines

Change to not install static library.
Change to strip binaries and libraries.

Add source compile methods

Add source compile methods

add check methods

Add source compile methods

Add check method
Correct the version number
Correct dependencies

Support "depends_on name => :build" style dependencies

Change to abort if no precompiled binary nor source is available

Change to not create static libraries for several packages

Update bc to 1.07.1 and add new related packages

change to use readline library

Change URL to mirror URL.
Add check method to perform `make test`.
Increment version number since configuration options are changed.

Increment verion number since configuration options are changed.

Correct dependencies

increment version number since configuration options are changed
add check method

Fix for a few requests

Need gettext to compile attr

Update zlibpkg to 1.2.11

Change to remove previous version just before install when it upgrades

Add build and check method