Since the Centos 5 image is not maintained anymore, there is no need to install
the custom CMake package originally intended to support GLIBC version from Centos 5.
Update options preferring their more explicit long form:
`-f` is `--fail`
`-s` is `--silent`
`-S` is `--show-error`
`-L` is `--location`
Additionally, `-O` is removed in favor of explicitly specifying the output file using `-o`
* Consistently use "/usr/src" as download and staging area
* install-cmake-binary: Introduce CMAKE_ROOT var
* build-and-install-openssl: Remove redundant -fPIC flag, download openssl sources using "wget"
Older versions of git included in older linux distributions are not able
to download source from Github. A newer version is required with a newer
OpenSSL. This requires to also build curl with the same OpenSSL.
CMake is downloaded precompiled if available (64bits system) or compiled
from source otherwise.
Jean-Christophe Fillion-Robin
Bensuperpc