glib2: Mark 2.48.2 as tested on gcc2.
glib2: Mark 2.48.2 as tested on gcc2.

Fixes #1414.

haikuports/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,moochris/haikuports,koletzky/haikuports,nielx/haikuports,haikuports/haikuports,nielx/haikuports,koletzky/haikuports,moochris/haikuports,haikuports/haikuports,moochris/haikuports,miqlas/haikuports,koletzky/haikuports,miqlas/haikuports,Begasus/haikuports,miqlas/haikuports,Begasus/haikuports,nielx/haikuports,Begasus/haikuports,Begasus/haikuports