test(config) Use parameterized tests to check all configurations

[Hywan]

This patch updates config_test.go to better test all combinations between compilers and engines and platforms and architectures

The Singlepass compiler is missing for the moment, since we are waiting on #204 to get merged before.

[Hywan]

bors try

[bors]

try

Build succeeded:

• Build and Test (1.15, linux-amd64, ubuntu-18.04)
• Build and Test (1.15, linux-aarch64, self-hosted, linux, ARM64)
• Build and Test (1.15, darwin-amd64, macos-latest)
• Build and Test (1.14, linux-amd64, ubuntu-18.04)
• Build and Test (1.14, linux-aarch64, self-hosted, linux, ARM64)
• Build and Test (1.14, darwin-amd64, macos-latest)

[Hywan]

On linux/amd64 (https://github.com/wasmerio/wasmer-go/runs/1928465505#step:6:16):

--- PASS: TestConfig_AllCombinations (0.01s)
--- PASS: TestConfig_AllCombinations/compiler=Cranelift,_engine=JIT (0.00s)
--- PASS: TestConfig_AllCombinations/compiler=Cranelift,_engine=Native (0.01s)
--- PASS: TestConfig_AllCombinations/compiler=Singlepass,_engine=JIT (0.00s)

On darwin/amd64 (https://github.com/wasmerio/wasmer-go/runs/1928465585#step:6:16):

--- PASS: TestConfig_AllCombinations (1.85s)
--- PASS: TestConfig_AllCombinations/compiler=Cranelift,_engine=JIT (0.00s)
--- PASS: TestConfig_AllCombinations/compiler=Cranelift,_engine=Native (1.85s)
--- PASS: TestConfig_AllCombinations/compiler=Singlepass,_engine=JIT (0.00s)

Singlepass works :-). Let's merge it!