net-snmp: refactor Makefile for optional variant with openssl and logging #21915

Job	Run time
Feeds Package Test Build / Test aarch64_generic	10m 4s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	9m 35s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	9m 47s
Feeds Package Test Build / Test i386_pentium-mmx	10m 39s
Feeds Package Test Build / Test mips_24kc	9m 12s
Feeds Package Test Build / Test mipsel_24kc	10m 19s
Feeds Package Test Build / Test powerpc_464fp	9m 15s
Feeds Package Test Build / Test powerpc_8548	9m 40s
Feeds Package Test Build / Test riscv64_riscv64	11m 26s
Feeds Package Test Build / Test x86_64	10m 35s
	1h 40m 32s

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