Rework "bsd socket" functionality
Added check in NutTcpReceive for NULL pointer access.
Fixed memory leak in SendIgmpMessage. The memory was allocated but not freed.
Corrected HttpResponseText
uhttp: added missing include (cfg/http.h)
STM32: Corrected SYSCLK_RES in case of MCU_STM3...
STM32: Corrected SetRccCfgr2, PLL was disabled ...
STM32: Corrected new_sysclk in SetSysClockSourc...