Cache generic Linux binaries CI, make architecture name handling cons… #240

Job	Run time
C++ tests on Linux	1m 18s
C++ tests on macOS	2m 19s
Apache2 tests on Linux	2m 2s
Nginx tests on Linux	2m 4s
Nginx dynamic module tests on Linux	1m 1s
Apache2 tests on macOS	2m 10s
Nginx tests on macOS	2m 14s
Nginx dynamic module tests on macOS	1m 16s
Passenger Standalone tests on Linux	2m 15s
Passenger Standalone tests on macOS	2m 17s
Homebrew packaging tests	1s
Node.js tests on Linux	17s
Node.js tests on macOS	1s
Ruby tests on Linux	1m 0s
Ruby tests on macOS	1s
Source packaging tests	32s
	20m 48s

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