libsigc++ (1.2): fix BUILD_PREREQUIRES, add debuginfo & TEST.
libsigc++ (1.2): fix BUILD_PREREQUIRES, add debuginfo & TEST.

Begasus/haikuports,Begasus/haikuports,haikuports/haikuports,nielx/haikuports,nielx/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,Begasus/haikuports,moochris/haikuports,haikuports/haikuports,moochris/haikuports,nielx/haikuports,moochris/haikuports,haikuports/haikuports,Begasus/haikuports