Add C++ prerequisite for Fedora. (#18602)

util/install/fedora.sh

@@ -6,9 +6,9 @@ _qmk_install() {
     # TODO: Check whether devel/headers packages are really needed
     sudo dnf $SKIP_PROMPT install \
         clang diffutils git gcc glibc-headers kernel-devel kernel-headers \
-        make unzip wget zip python3 avr-binutils avr-gcc avr-libc \
-        arm-none-eabi-binutils-cs arm-none-eabi-gcc-cs arm-none-eabi-newlib \
-        avrdude dfu-programmer dfu-util hidapi libusb-devel
+        make unzip wget zip python3 avr-binutils avr-gcc avr-gcc-c++ avr-libc \
+        arm-none-eabi-binutils-cs arm-none-eabi-gcc-cs arm-none-eabi-gcc-cs-c++ \
+        arm-none-eabi-newlib avrdude dfu-programmer dfu-util hidapi libusb-devel
 
     python3 -m pip install --user -r $QMK_FIRMWARE_DIR/requirements.txt
 }