I will answer to myself. Problem were in wrong definition of IRQ pin in sketch. But, as I found out STM32F103C8T6 has SPI 1 running on 72MHz (for SPI max 72/2 = 36MHz) and SPI 2 36MHz (for SPI max 36/2 = 18MHz) so it were a stupid idea to wire TFT display to SPI 2 port which is slower than SPI 1 with RFM69HW which doesnt need so fast SPI. Therefore I switched radio to SPI-2 and TFT display to faster SPI-1.
Radio SPI-2 and TFT ILI9341 SPI-1 wiring
// RFM69HW radio on SPI-2
//
// CS / NSS - PB12
// DI00 / IRQ - PA8
// SCK - PB13
// MISO - PB14
// MOSI - PB15
// TFT DISPLAY ili9341 on SPI-1
//
// CS - PA4
// RESET /RST - PA2
// DC / RS - PA3
// SCK - PA5
// MISO - PA6
// MOSI - PA7
Add to sketch before #include <MySensors.h>
#define MY_RFM69_NEW_DRIVER
#define MY_RFM69_IRQ_PIN PA8
#define MY_RFM69_IRQ_NUM PA8
#define MY_RFM69_CS_PIN PB12
#define MY_RFM69_STM32F103_SPI2
//#define MY_RFM69_SPI_SPEED (18*1000000ul) //When SPI-2 speed needs to be reduced
//Possible speeds on SPI 2 for RFM69HW:
//
//SPI_CLOCK_DIV2 = 36 / 2 = 18 MHz
//SPI_CLOCK_DIV4 = 36 / 4 = 9 MHz
//SPI_CLOCK_DIV8 = 36 / 8 = 4.5 MHz
//SPI_CLOCK_DIV16 = 36 / 16 = 2.25 MHz
//SPI_CLOCK_DIV32 = 36 / 32 = 1.125 MHz
As you can see there is a new defined parameter MY_RFM69_STM32F103_SPI2 so if we want to use SPI 2 then modification of RFM69_new.h is needed.
Edit file: MySensors-master/hal/transport/RFM69/driver/new/RFM69_new.h
Add following lines after line 112 (after #include <SPI.h>)
#if defined(MY_RFM69_STM32F103_SPI2)
SPIClass SPI_2(2);
#define RFM69_SPI SPI_2
#endif
Modified RFM69_new.h should looks like:
#if defined(ARDUINO) && !defined(__arm__) && !defined(RFM69_SPI)
#include <SPI.h>
#if defined(MY_SOFTSPI)
SoftSPI<MY_SOFT_SPI_MISO_PIN, MY_SOFT_SPI_MOSI_PIN, MY_SOFT_SPI_SCK_PIN, RFM69_SPI_DATA_MODE>RFM69_SPI;
#else
#define RFM69_SPI SPI
#endif
#else
#if defined(__arm__) || defined(__linux__)
#include <SPI.h>
#if defined(MY_RFM69_STM32F103_SPI2) //!< ADD THIS AFTER LINE 112
SPIClass SPI_2(2); //!< ADD THIS AFTER LINE 112
#define RFM69_SPI SPI_2 //!< ADD THIS AFTER LINE 112
#endif //!< ADD THIS AFTER LINE 112
#else
extern HardwareSPI SPI; //!< SPI
#endif
#if !defined(RFM69_SPI)
#define RFM69_SPI SPI //!< SPI
#endif
#endif
