package/libressl: bump to version 3.0.2

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

[Thomas: cherry-picked to master as it fixes a build issue with the
musl C library:
 output/build/libressl-2.9.2/crypto/compat/getprogname_linux.c: In function ‘getprogname’:
 output/build/libressl-2.9.2/crypto/compat/getprogname_linux.c:32:2: error: #error "Cannot emulate getprogname"
 #error "Cannot emulate getprogname"]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>