Add x86_64 platform because the latest build version of cmake does not still...

Add x86_64 platform because the latest build version of cmake does not still support glibc of CentOS 6

README.md

 # Cmake
 
-Pipeline to build recent version of Cmake for our legacy CentOS 32 bits platform.
-
-Cmake provides independent 64 bits Linux distribution that works on CentOS 6 64 bits but they are not available for 32 bits:
-* https://cmake.org/files/v3.26/cmake-3.28.3-linux-x86_64.tar.gz
+Pipeline to build recent version of Cmake for our legacy CentOS 6 32 and 64 bits platform.
 
 Allows to build Cmake for:
+* CentOS 6.10 64 bits: [cmake-3.28.3-linux-x86_64.zip](https://gitlab.synchrotron-soleil.fr/software-control-system/devtools/cmake/-/jobs/artifacts/3.28.3/download?job=linux-x86_64)
 * CentOS 6.10 32 bits: [cmake-3.28.3-linux-i686.zip](https://gitlab.synchrotron-soleil.fr/software-control-system/devtools/cmake/-/jobs/artifacts/3.28.3/download?job=linux-i686)