CPP: Fix stringutil_test literal types
CPP: Fix stringutil_test literal types

This failed with OSX 10.6 default gcc-4.2 and macports gcc-4.8.

mlevytskiy/libphonenumber,tg123/libphonenumber,roes/libphonenumber,ceosilvajr/libphonenumber,JasOXIII/libphonenumber,mtownsen/libphonenumber,lcorbasson/libphonenumber,weitzhandler/libphonenumber,mihaelacr-google/libphonenumber,mihaelacr-google/libphonenumber,javimey/libphonenumber,ceosilvajr/libphonenumber,JasOXIII/libphonenumber,weitzhandler/libphonenumber,karimhb/libphonenumber,pplatek/libphonenumber,roes/libphonenumber,johnnyshields/libphonenumber,tg123/libphonenumber,gautier-gdx/libphonenumber,mcanthony/libphonenumber,pchero/libphonenumber,mcanthony/libphonenumber,weitzhandler/libphonenumber,johnnyshields/libphonenumber,fishman1986/libphonenumber,gautier-gdx/libphonenumber,mujiansu/libphonenumber,javimey/libphonenumber,lcorbasson/libphonenumber,mlevytskiy/libphonenumber,keghani/libphonenumber,mujiansu/libphonenumber,dpocock/libphonenumber,shelsonjava/libphonenumber,Corei13/libphonenumber,alecx/libphonenumber,fishman1986/libphonenumber,waveremit/libphonenumber,Corei13/libphonenumber,waveremit/libphonenumber,mihaelacr-google/libphonenumber,pchero/libphonenumber,alecx/libphonenumber,fishman1986/libphonenumber,mistrydarshan99/libphonenumber,roes/libphonenumber,seegno-forks/libphonenumber,tg123/libphonenumber,mcanthony/libphonenumber,ceosilvajr/libphonenumber,joharmandav/libphonenumber,alucic/libphonenumber,Corei13/libphonenumber,dpocock/libphonenumber,JasOXIII/libphonenumber,Corei13/libphonenumber,karimhb/libphonenumber,ceosilvajr/libphonenumber,javimey/libphonenumber,gautier-gdx/libphonenumber,keghani/libphonenumber,mistrydarshan99/libphonenumber,google/libphonenumber,mlevytskiy/libphonenumber,mlevytskiy/libphonenumber,shelsonjava/libphonenumber,hejunbinlan/libphonenumber,pplatek/libphonenumber,joharmandav/libphonenumber,stevenliuit/libphonenumber,mistrydarshan99/libphonenumber,mujiansu/libphonenumber,pplatek/libphonenumber,digideskio/libphonenumber,gautier-gdx/libphonenumber,joharmandav/libphonenumber,dpocock/libphonenumber,google/libphonenumber,mtownsen/libphonenumber,gautier-gdx/libphonenumber,google/libphonenumber,keghani/libphonenumber,pplatek/libphonenumber,johnnyshields/libphonenumber,mistrydarshan99/libphonenumber,javimey/libphonenumber,roes/libphonenumber,mlevytskiy/libphonenumber,fishman1986/libphonenumber,seegno-forks/libphonenumber,hejunbinlan/libphonenumber,mcanthony/libphonenumber,lcorbasson/libphonenumber,karimhb/libphonenumber,shelsonjava/libphonenumber,alecx/libphonenumber,dpocock/libphonenumber,joharmandav/libphonenumber,stevenliuit/libphonenumber,fishman1986/libphonenumber,stevenliuit/libphonenumber,waveremit/libphonenumber,karimhb/libphonenumber,waveremit/libphonenumber,pchero/libphonenumber,mcanthony/libphonenumber,seegno-forks/libphonenumber,hejunbinlan/libphonenumber,alecx/libphonenumber,karimhb/libphonenumber,mujiansu/libphonenumber,stevenliuit/libphonenumber,alecx/libphonenumber,johnnyshields/libphonenumber,alucic/libphonenumber,keghani/libphonenumber,shelsonjava/libphonenumber,johnnyshields/libphonenumber,hejunbinlan/libphonenumber,keghani/libphonenumber,pchero/libphonenumber,tg123/libphonenumber,mihaelacr-google/libphonenumber,mujiansu/libphonenumber,mtownsen/libphonenumber,lcorbasson/libphonenumber,lcorbasson/libphonenumber,stevenliuit/libphonenumber,mtownsen/libphonenumber,alucic/libphonenumber,waveremit/libphonenumber,digideskio/libphonenumber,digideskio/libphonenumber,pplatek/libphonenumber,mtownsen/libphonenumber,hejunbinlan/libphonenumber,JasOXIII/libphonenumber,weitzhandler/libphonenumber,tg123/libphonenumber,shelsonjava/libphonenumber,digideskio/libphonenumber,pchero/libphonenumber,weitzhandler/libphonenumber,alucic/libphonenumber,digideskio/libphonenumber,roes/libphonenumber,ceosilvajr/libphonenumber,google/libphonenumber,javimey/libphonenumber,JasOXIII/libphonenumber,Corei13/libphonenumber,mistrydarshan99/libphonenumber,mihaelacr-google/libphonenumber,google/libphonenumber,dpocock/libphonenumber,seegno-forks/libphonenumber,alucic/libphonenumber,joharmandav/libphonenumber,google/libphonenumber