test: Ensure the custom_wasmer_runtime tag works

[Hywan]

Fixes #191.
Fixes #194.

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Already running a review

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Build failed:

• Build and Test (1.14, linux-aarch64, self-hosted, linux, ARM64)

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Build failed:

• Build and Test (1.14, linux-amd64, ubuntu-18.04, wasmer-linux-amd64.tar.gz)

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Build failed:

• Build and Test (1.15, linux-amd64, ubuntu-18.04, wasmer-linux-amd64.tar.gz)

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Build failed:

• Build and Test (1.15, linux-amd64, ubuntu-18.04, wasmer-linux-amd64.tar.gz)

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Build failed:

• Build and Test (1.14, linux-amd64, ubuntu-18.04, wasmer-linux-amd64.tar.gz)

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Build failed:

• Build and Test (1.15, linux-amd64, ubuntu-18.04, wasmer-linux-amd64.tar.gz)

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Normally it works. It fails just because the latest release of Wasmer doesn't include the wasmer_is_compiler_available & siblings symbols yet. We can wait on a new release.

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Build failed:

• Build and Test (1.15, linux-amd64, ubuntu-18.04, wasmer-linux-amd64.tar.gz)

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Build failed:

• Build and Test against a custom Wasmer library (1.15, darwin-amd64, macos-latest)

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Build failed:

• Build and Test against a custom Wasmer library (1.15, linux-aarch64, self-hosted, linux, ARM64)

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bors try

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Build failed:

• Build and Test against a custom Wasmer library (1.15, linux-amd64, ubuntu-18.04)

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Build succeeded:

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