Ben Clayton dac38b8fce Add basic GN configurations ...

This allows glslang to be build standalone using the gn build system.

To build with gn:

```
gclient sync --gclientfile=standalone.gclient
gn gen out/default
cd out/default
ninja
```

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..

build.gni

Add basic GN configurations

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glslang.gni

Add basic GN configurations

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spirv_tools.gni

Add basic GN configurations

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