libeigen: update SRC_URI to download from gitlab
libeigen: update SRC_URI to download from gitlab

Bitbucket is no longer the official home of eigen, which has moved to
gitlab. Update SRC_URI to download releases from gitlab, fixing:
WARNING: libeigen-3.3.7-r0 do_fetch: Failed to fetch URL
https://bitbucket.org/eigen/eigen/get/3.3.7.tar.bz2;downloadfilename=libeigen-3.3.7.tar.bz2,
attempting MIRRORS if available

Signed-off-by: Diego Rondini <f48a046fa74db96735a4084e98d9bb18d62ce377@kynetics.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,VCTLabs/meta-openembedded,VCTLabs/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,moto-timo/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,moto-timo/meta-openembedded,VCTLabs/meta-openembedded,moto-timo/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,openembedded/meta-openembedded