Fix for building against musl libc

[basti1302]

Fix for building against musl libc

This fix enables the package to be built against
musl libc instead of glibc. Musl libc is
used in the Linux Alpine distro and since the
official Node.js Docker repo
advertises its Alpine based images as "highly recommended
when final image size being as small as possible is desired", it turns
out that quite a few people run Node.js on Alpine via these images.

This change should not have any impact on systems that use the more
widespread glibc, as the updated imports should be available in all
libc variants.

[basti1302]

I've used the following Dockerfiles to verify the package in Alpine and Jessie. I did not verify anything in Windows, though.

Alpine, Node 10

FROM node:10-alpine
WORKDIR /usr/src/app
COPY package*.json ./
RUN apk add --no-cache --virtual .gyp \
        build-base \
        python \
        git \
    && npm install
COPY . .
RUN npm install --global node-gyp
RUN node-gyp rebuild
CMD [ "npm", "test" ]

Jessie, Node 10.

FROM node:10
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm install --global node-gyp
RUN node-gyp rebuild
CMD [ "npm", "test" ]

Alpine, Node 8

FROM node:8.12.0-alpine
WORKDIR /usr/src/app
COPY package*.json ./
RUN apk add --no-cache --virtual .gyp \
        build-base \
        python \
        git \
    && npm install
COPY . .
RUN npm install --global node-gyp
RUN node-gyp rebuild
CMD [ "npm", "test" ]

The node-gyp build finished with gyp info ok and the tests were green for all three.

[JacobFischer]

Thanks! I'll double check this evening to make sure everything seems solid, and if so I'll merge this PR and update the package to 1.1.1.

[basti1302]

Sounds great! Thanks.

[JacobFischer]

Yup looks good!

[basti1302]

Thanks for merging and publishing! 🎉