Add parenthesis to macro substitutions where necessary
Add parenthesis to macro substitutions where necessary

Based on patch by Yu Feng.

frida/vala,playya/vala,lovebug356/vala,kamanashisroy/aroop,kamanashisroy/aroop,frida/vala,themiwi/vala,Distrotech/vala,flobrosch/vala-fixes,spidermonkdust/vala,xdave/pvala,flobrosch/vala-fixes,Jc2k/vala,frida/vala,GNOME/vala,rvu95/vala,jessevdk/vala,tjol/vala-tjol,playya/vala,frida/vala,GNOME/vala,severinh/vala,jessevdk/vala,rvu95/vala,tjol/vala-tjol,phako/vala,jessevdk/vala,playya/vala,themiwi/vala,lovebug356/vala,Jc2k/vala,frida/vala,Distrotech/vala,GNOME/vala,flobrosch/vala-fixes,severinh/vala,spidermonkdust/vala,phako/vala,kamanashisroy/aroop,tjol/vala-tjol,rvu95/vala,spidermonkdust/vala,themiwi/vala,Distrotech/vala,severinh/vala,GNOME/vala