Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Bump debhelper from deprecated 9 to 10. (package-uses-deprecated-debhelper-compat-version)
• Drop unnecessary dependency on dh-autoreconf. (useless-autoreconf-build-depends)
• Update Vcs-* headers from URL redirect. (vcs-obsolete-in-debian-infrastructure)
• Use canonical URL in Vcs-Git. (vcs-field-not-canonical)
• Remove field Section on binary package libwebrtc-audio-processing1 that duplicates source. (installable-field-mirrors-source)
• Trim trailing whitespace. (trailing-whitespace)
• Set upstream metadata fields: Repository-Browse. (upstream-metadata-file-is-missing)

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

Control files of package libwebrtc-audio-processing-dev: lines which differ (wdiff format)

• Homepage: [-http​://freedesktop.org/software/pulseaudio/webrtc-audio-processing/-] {+https​://freedesktop.org/software/pulseaudio/webrtc-audio-processing/+}

Control files of package libwebrtc-audio-processing1: lines which differ (wdiff format)

• Homepage: [-http​://freedesktop.org/software/pulseaudio/webrtc-audio-processing/-] {+https​://freedesktop.org/software/pulseaudio/webrtc-audio-processing/+}

No differences were encountered between the control files of package **libwebrtc-audio-processing1-dbgsym**

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Build and test logs for this branch can be found at https://janitor.debian.net/run/9e7a9fec-f340-488a-b47e-1e6516c7a545.