package/tinyxml2: bump to version 7.0.1

package/tinyxml2: bump to version 7.0.1

Even though the hash of the license file changes, there are no changes
in the licensing terms themselves. There are changes in other parts of
readme.md, and whitespace changes in the licensing terms, but no
licensing term changes per-se.

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
[Thomas: add explanation about the license file hash change]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>