Expat-2.4.6

Reference: 8.38. Expat-2.4.6. Expat is first required as runtime dependency of mesa. Fix the build system:

patch -Np1 -i expat-2.4.6-bld-20220330.patch

Apply a patch to fix the sources:

patch -Np1 -i expat-2.4.6-src-20220330.patch

Configure the package:

./configure --prefix=/libs --includedir=/libs/inc --docdir=/tmp

Build and install expat:

make
make install

Move the pkg-config file to a more proper location:

mv -v /libs/lib/pkgconfig/expat.pc /plng/lib/pkgconfig/