improve the way parse_pkgbuilds.sh is called

1) check the return value. before a failed call to parse_pkgbuilds.sh was
completely silent.. not good :)

2) call realpath on check_packages.py before determining the directory name,
to figure out where parse_pkgbuilds.sh is. This allows to symlink
check_packages.py and use the symlink without moving parse_pkgbuilds.sh .

for example : /foo/bar/ contains check_packages.py and parse_pkgbuilds.sh
ln -s /foo/bar/check_packages.py /bin/check_package

dirname(/bin/check_package) returns /bin/ so not good
dirname(realpath(/bin/check_package)) returns /foo/bar/ so good

Signed-off-by: Xavier Chantry <shiningxc@gmail.com>
Signed-off-by: Aaron Griffin <aaronmgriffin@gmail.com>

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