libpng: Correct the package name and create softlink
libpng: Correct the package name and create softlink

Follow debian, the correct name of dev package is libpng12-dev.
And create /usr/include/libpng link to /usr/include/libpng12

Signed-off-by: Hoang Trong Nghia <b874396fbdd8843df5170c2f0d7bd61e089f462b@toshiba-tsdv.com>

meta-debian/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian