mesa: clean up dependencies #83

Job	Run time
Feeds Package Test Build / Test aarch64_generic	3h 22m 4s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	4h 3m 47s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	4h 2m 17s
Feeds Package Test Build / Test i386_pentium-mmx	4h 0m 1s
Feeds Package Test Build / Test mips_24kc	3h 53m 8s
Feeds Package Test Build / Test mipsel_24kc	3h 51m 19s
Feeds Package Test Build / Test powerpc_464fp	24m 30s
Feeds Package Test Build / Test powerpc_8548	24m 21s
Feeds Package Test Build / Test riscv64_riscv64	3h 21m 56s
Feeds Package Test Build / Test x86_64	3h 20m 18s
	1d 6h 43m 41s

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