Updated build.sh to build curl, openssl, and 256k1 if needed

openssl-3.4.2/doc/man1/openssl-rand.pod

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+=pod
+
+=begin comment
+
+WARNING: do not edit!
+Generated by Makefile from doc/man1/openssl-rand.pod.in
+
+=end comment
+
+=head1 NAME
+
+openssl-rand - generate pseudo-random bytes
+
+=head1 SYNOPSIS
+
+B<openssl rand>
+[B<-help>]
+[B<-out> I<file>]
+[B<-base64>]
+[B<-hex>]
+[B<-engine> I<id>]
+[B<-rand> I<files>]
+[B<-writerand> I<file>]
+[B<-provider> I<name>]
+[B<-provider-path> I<path>]
+[B<-propquery> I<propq>]
+I<num>[K|M|G|T]
+
+=head1 DESCRIPTION
+
+This command generates I<num> random bytes using a cryptographically
+secure pseudo random number generator (CSPRNG). A suffix [K|M|G|T] may be
+appended to the num value to indicate the requested value be scaled as a
+multiple of KiB/MiB/GiB/TiB respectively. Note that suffixes are case
+sensitive, and that the suffixes represent binary multiples
+(K = 1024 bytes, M = 1024*1024 bytes, etc).
+
+The string 'max' may be substituted for a numerical value in num, to request the
+maximum number of bytes the CSPRNG can produce per instantiation.  Currently,
+this is restricted to 2^61 bytes as per NIST SP 800-90C.
+
+The random bytes are generated using the L<RAND_bytes(3)> function,
+which provides a security level of 256 bits, provided it managed to
+seed itself successfully from a trusted operating system entropy source.
+Otherwise, the command will fail with a nonzero error code.
+For more details, see L<RAND_bytes(3)>, L<RAND(7)>, and L<EVP_RAND(7)>.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-help>
+
+Print out a usage message.
+
+=item B<-out> I<file>
+
+Write to I<file> instead of standard output.
+
+=item B<-base64>
+
+Perform base64 encoding on the output.
+
+=item B<-hex>
+
+Show the output as a hex string.
+
+=item B<-engine> I<id>
+
+See L<openssl(1)/Engine Options>.
+This option is deprecated.
+
+=item B<-rand> I<files>, B<-writerand> I<file>
+
+See L<openssl(1)/Random State Options> for details.
+
+=item B<-provider> I<name>
+
+=item B<-provider-path> I<path>
+
+=item B<-propquery> I<propq>
+
+See L<openssl(1)/Provider Options>, L<provider(7)>, and L<property(7)>.
+
+=back
+
+=head1 SEE ALSO
+
+L<openssl(1)>,
+L<RAND_bytes(3)>,
+L<RAND(7)>,
+L<EVP_RAND(7)>
+
+=head1 HISTORY
+
+The B<-engine> option was deprecated in OpenSSL 3.0.
+
+=head1 COPYRIGHT
+
+Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut