gcc: Configure --with-local-prefix for Linuxbrew
gcc: Configure --with-local-prefix for Linuxbrew

Search $HOMEBREW_PREFIX/local/include rather than /usr/local/include.

Linuxbrew/linuxbrew,drbenmorgan/linuxbrew,sjackman/linuxbrew,DoomHammer/linuxbrew,Homebrew/linuxbrew,sjackman/linuxbrew,gnubila-france/linuxbrew,sjackman/linuxbrew,Angeldude/linuxbrew,reelsense/linuxbrew,saketkc/linuxbrew,drbenmorgan/linuxbrew,reelsense/linuxbrew,gnubila-france/linuxbrew,reelsense/linuxbrew,DoomHammer/linuxbrew,reelsense/linuxbrew,Linuxbrew/linuxbrew,Homebrew/linuxbrew,Homebrew/linuxbrew,SuperNEMO-DBD/cadfaelbrew,Angeldude/linuxbrew,Angeldude/linuxbrew,gnubila-france/linuxbrew,saketkc/linuxbrew,Linuxbrew/linuxbrew,sjackman/linuxbrew,SuperNEMO-DBD/cadfaelbrew,Linuxbrew/linuxbrew,saketkc/linuxbrew,SuperNEMO-DBD/cadfaelbrew,gnubila-france/linuxbrew,Homebrew/linuxbrew,drbenmorgan/linuxbrew,saketkc/linuxbrew,SuperNEMO-DBD/cadfaelbrew,DoomHammer/linuxbrew,drbenmorgan/linuxbrew,Angeldude/linuxbrew,DoomHammer/linuxbrew