wasm: build: fix vlc tools PATH setting
Previously:
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$PATH was set incorrectly to wasm-emscripten/bin which is supposed to be wasm-emscripten/build/bin
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$PATH was updated after making the tools
Hence,
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The tools would be rebuilt every time build script is run.
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The setting of PATH variable would do nothing anyway even if it was correct, as correct PATH is going to be set by the configure script later anyway.
This patch will repurpose the line to avoid rebuilding of already built tools.