NSSystemInfoPanel.m: add more space for the Credits scroll view, if the Credits.rtf file was found.
NSSystemInfoPanel.m: add more space for the Credits scroll view, if the Credits.rtf file was found.

uptime-services/development-arts,mpw/marcelweiher-libobjc2,berkus/cocotron,berkus/cocotron,liruqi/cocotron,berkus/cocotron,berkus/cocotron,liruqi/cocotron,uptime-services/development-arts,mpw/marcelweiher-libobjc2,liruqi/cocotron,uptime-services/development-arts,liruqi/cocotron,mpw/marcelweiher-libobjc2,mpw/marcelweiher-libobjc2,uptime-services/development-arts