[R] Package build system adds line break in DESCRIPTION URL

[Daniel Lewandowski]

Has anybody noticed that if field URL in DESCRIPTION contains a uri with 
66 or more characters, then file DESCRIPTION in the resulting package 
includes a line break at the beginning?

So this (source DESCRIPTION):

URL: 
http://ecdc.europa.eu/en/data-tools/seroincidence-calculator-tool/Pages/default.aspx

becomes (again file DESCRIPTION, but inside the package)

URL:
http://ecdc.europa.eu/en/data-tools/seroincidence-calculator-tool/Pages/default.aspx

This has been tested with R on Windows 8.1 (devel 01/04/2015 and 3.1.3) 
and Linux Mint (3.1.3). It has many sad implications including not 
acceptance of such packages to CRAN.