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deps: suppress zlib compiler warnings

Rodrigo Muino Tomonari requested to merge github/fork/danbev/zlib-warnings into master

Currently, there are a number of compilation warnings from zlib like the following one:

../deps/zlib/infback.c: In function ‘inflateBack’:
../deps/zlib/infback.c:479:25: warning:
this statement may fall through [-Wimplicit-fallthrough=]
  479 |             state->mode = LEN;
      |             ~~~~~~~~~~~~^~~~~
../deps/zlib/infback.c:481:9: note: here
  481 |         case LEN:
      |         ^~~~

In this case there is no break statement and the intention is to fall through:

           Tracev((stderr, "inflate:       codes ok\n"));
           state->mode = LEN;

        case LEN:

This commit adds -Wno-implicit-fallthrough to zlib.gyp to suppress these warnings.

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