Add support for finding Javascript source libraries with Emscripten.

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+## Add support for `find_library` in Emscripten
+
+The `find_library` method can be used to find your own JavaScript
+libraries. The limitation is that they must have the file extension
+`.js`. Other library lookups will look up "native" libraries from the
+system like currently. A typical usage would look like this:
+
+```meson
+glue_lib = cc.find_library('gluefuncs.js',
+                           dirs: meson.current_source_dir())
+executable('prog', 'prog.c',
+           dependencies: glue_lib)
+```