wp_seed_src: read /dev/urandom via raw fd to avoid seccomp SIGSYS (#440) #1216

Job	Run time
discover_versions / Resolve wolfSSL + OpenSSL refs	9s
Command line test (master, master, WOLFPROV_DEBUG=1)	9m 53s
Command line test (master, v5.9.2-stable)	1m 43s
Command line test (openssl-3.6.3, master, WOLFPROV_DEBUG=1)	2m 12s
Command line test (openssl-3.6.3, v5.9.2-stable)	1m 37s
Command line test (master, v5.8.4-stable, WOLFPROV_DEBUG=1)	3m 57s
Command line test (openssl-3.6.3, v5.9.2-stable, WOLFPROV_DEBUG=1)	1m 51s
Command line test (openssl-3.6.3, v5.8.4-stable, WOLFPROV_DEBUG=1)	1m 47s
Command line test (openssl-3.6.3, master)	1m 20s
Command line test (master, v5.9.2-stable, WOLFPROV_DEBUG=1)	1m 24s
Command line test (openssl-3.6.3, v5.8.4-stable)	2m 5s
Command line test (master, v5.8.4-stable)	1m 22s
Command line test (master, master)	1m 47s
	31m 7s

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