fix gxml.pc.in
seeing version compare issue as below
Unknown version comparison operator '>=2.9.13' after package name 'libxml-2.0' in file '/opt/homebrew/lib/pkgconfig/gxml-0.20.pc'
seeing version compare issue as below
Unknown version comparison operator '>=2.9.13' after package name 'libxml-2.0' in file '/opt/homebrew/lib/pkgconfig/gxml-0.20.pc'