package/gcc: switch to https urls for archives hashes

FTP urls doesn't work anymore with Firefox [1] and Google Chrome [2],
switch to https urls.

[1] https://blog.mozilla.org/addons/2020/04/13/what-to-expect-for-the-upcoming-deprecation-of-ftp-in-firefox/
[2] https://chromestatus.com/feature/6246151319715840

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gcc/gcc.hash

@@ -1,10 +1,10 @@
-# From ftp://gcc.gnu.org/pub/gcc/releases/gcc-8.4.0/sha512.sum
+# From https://gcc.gnu.org/pub/gcc/releases/gcc-8.4.0/sha512.sum
 sha512  6de904f552a02de33b11ef52312bb664396efd7e1ce3bbe37bfad5ef617f133095b3767b4804bc7fe78df335cb53bc83f1ac055baed40979ce4c2c3e46b70280  gcc-8.4.0.tar.xz
-#  From ftp://gcc.gnu.org/pub/gcc/releases/gcc-9.4.0/sha512.sum
+#  From https://gcc.gnu.org/pub/gcc/releases/gcc-9.4.0/sha512.sum
 sha512  dfd3500bf21784b8351a522d53463cf362ede66b0bc302edf350bb44e94418497a8b4b797b6af8ca9b2eeb746b3b115d9c3698381b989546e9151b4496415624  gcc-9.4.0.tar.xz
-# From ftp://gcc.gnu.org/pub/gcc/releases/gcc-10.3.0/sha512.sum
+# From https://gcc.gnu.org/pub/gcc/releases/gcc-10.3.0/sha512.sum
 sha512  2b2dd7453d48a398c29eaebd1422b70341001b8c90a62aee51e83344e7fdd8a8e45f82a4a9165bd7edc76dada912c932f4b6632c5636760fec4c5d7e402b3f86  gcc-10.3.0.tar.xz
-# From ftp://gcc.gnu.org/pub/gcc/releases/gcc-11.3.0/sha512.sum
+# From https://gcc.gnu.org/pub/gcc/releases/gcc-11.3.0/sha512.sum
 sha512  f0be5ad705c73b84477128a69c047f57dd47002f375eb60e1e842e08cf2009a509e92152bca345823926d550b7395ae6d4de7db51d1ee371c2dc37313881fca7  gcc-11.3.0.tar.xz
 
 # Locally calculated (fetched from Github)