Only download Microchip pack if avr-libc doesnt support ATtiny3216

cmake/libc-version-test.cpp

@@ -0,0 +1,17 @@
+#if __has_include(<component-version.h>)
+#include <component-version.h>
+#if ((COMPONENT_VERSION_MAJOR == 1) && (COMPONENT_VERSION_MINOR == 2) &&       \
+     (BUILD_NUMBER < 118))
+#error                                                                         \
+    "Microchip pack component version greater than 1.2.118 required to support ATtiny3216"
+#endif
+#else
+#include <avr/version.h>
+#if !(__AVR_LIBC_VERSION__ > 20100UL)
+#error "AVR LibC version greater than 2.1 does support ATtiny3216"
+#endif
+#endif
+
+#include <avr/io.h>
+
+int main() { return 0; }