Merge pull request #1691 from bettio/fix-too-long-initializer-string

NIFs: fix "warning: initializer-string for character array is too long"

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

src/libAtomVM/nifs.c

@@ -4163,7 +4163,13 @@ static term nif_console_print(Context *ctx, int argc, term argv[])
     return OK_ATOM;
 }
 
-static char b64_table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+static char b64_table[64] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
+                             'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
+                             'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
+                             'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+                             'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
+                             'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
+                             '8', '9', '+', '/'};
 
 // per https://tools.ietf.org/rfc/rfc4648.txt