Duplicate json symbols on static builds

Hi,

It seems that symbols for json are duplicated now:

Link static libs together using libtool
ld: warning: passed two min versions (9.0, 9.0) for platform iOS. Using 9.0.
ld: warning: arm64 function not 4-byte aligned: _merge8_arm_sve from /Users/unidan/Workspace/VLCKit/libvlc/vlc/build-iphoneos-arm64/build/modules/.libs/libdeinterlace_plugin.a(merge_sve.o)
ld: warning: arm64 function not 4-byte aligned: _merge16_arm_sve from /Users/unidan/Workspace/VLCKit/libvlc/vlc/build-iphoneos-arm64/build/modules/.libs/libdeinterlace_plugin.a(merge_sve.o)
duplicate symbol '_json_parse' in:
    /Users/unidan/Workspace/VLCKit/libvlc/vlc/build-iphoneos-arm64/build/modules//.libs/libvlc_json.a(libvlc_json_la-grammar.o)
    /Users/unidan/Workspace/VLCKit/libvlc/vlc/build-iphoneos-arm64/build/modules/.libs/libfingerprinter_plugin.a(libfingerprinter_plugin_la-json.o)
ld: 1 duplicate symbol for architecture arm64

The build here is a custom branch rebased on master, but the issue would remain on current master.

I'd suggest to rename the new json parser functions by prefixing them with vlc_ to workaround this issue in the short term, and potentially remove the other implementation in the long term.

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