Cache generic Linux binaries CI, make architecture name handling cons… #241

Job	Run time
C++ tests on Linux	1m 17s
Apache2 tests on Linux	2m 6s
C++ tests on macOS	3m 48s
Apache2 tests on macOS	2m 28s
Nginx tests on Linux	2m 9s
Nginx tests on macOS	3m 58s
Nginx dynamic module tests on Linux	1m 1s
Node.js tests on Linux	25s
Nginx dynamic module tests on macOS	1m 14s
Node.js tests on macOS	34s
Ruby tests on Linux	1m 0s
Ruby tests on macOS	1m 10s
Passenger Standalone tests on Linux	4m 1s
Passenger Standalone tests on macOS	3m 56s
Homebrew packaging tests	6m 20s
Source packaging tests	25s
	35m 52s

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