bird2: replace gcc flag workaround with patch fixing alignment issues #802

Job	Run time
Feeds Package Test Build / Test aarch64_generic	4m 16s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	5m 29s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	5m 29s
Feeds Package Test Build / Test i386_pentium-mmx	4m 39s
Feeds Package Test Build / Test mips_24kc	4m 28s
Feeds Package Test Build / Test mipsel_24kc	5m 36s
Feeds Package Test Build / Test powerpc_464fp	4m 33s
Feeds Package Test Build / Test powerpc_8548	4m 6s
Feeds Package Test Build / Test riscv64_riscv64	5m 30s
Feeds Package Test Build / Test x86_64	4m 41s
	48m 47s

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