package/libsvgtiny: fix build with latest gperf

Remove second patch and retrieve two upstream patches to fix build with
latest gperf

Fixes:
 - http://autobuild.buildroot.org/results/51be63089209d38c2cf29b0e0b08f73a0e15c467



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>