ant version 1.8.2 or later is required for Tomcat 7 build

[Violeta Georgieva]

Hi,

With r1570844 Tomcat build requires ant  version 1.8.2 or later.
The BUILDING.txt describes "Install Apache Ant 1.8.x on your computer".
 I will change it to "Install Apache Ant 1.8.2 or later on your computer".
Wdyt?

Regards
Violeta