Commit b83184de67 (package/libjpeg: switch to s.b.o. as source site)
improperly added a trailing slash '/' at the end of LIBJPEG_SITE,
causing builds to fail:
package/libjpeg/libjpeg.mk:35: *** LIBJPEG_SITE (http://sources.buildroot.org/libjpeg/) cannot have a trailing slash. Stop.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>