gsl: Do not use `weak' modifier where it is not applicable
gsl: Do not use `weak' modifier where it is not applicable

kamanashisroy/aroop,rvu95/vala,frida/vala,jessevdk/vala,themiwi/vala,kamanashisroy/aroop,rvu95/vala,spidermonkdust/vala,themiwi/vala,frida/vala,jessevdk/vala,playya/vala,severinh/vala,frida/vala,jessevdk/vala,tjol/vala-tjol,flobrosch/vala-fixes,playya/vala,Distrotech/vala,tjol/vala-tjol,kamanashisroy/aroop,themiwi/vala,flobrosch/vala-fixes,severinh/vala,Distrotech/vala,spidermonkdust/vala,GNOME/vala,frida/vala,xdave/pvala,playya/vala,GNOME/vala,flobrosch/vala-fixes,Distrotech/vala,GNOME/vala,spidermonkdust/vala,severinh/vala,rvu95/vala,frida/vala,GNOME/vala,tjol/vala-tjol