Add cmake compatibility to c-api (#4369)

* Add cmake compatibility to c-api

* Add CMake documentation to wasmtime.h

* Add CMake instructions in examples

* Modify CI for CMake support

* Use correct rust in CI

* Trigger build

* Refactor run-examples

* Reintroduce example_to_run in run-examples

* Replace run-examples crate with cmake

* Fix markdown formatting in examples readme

* Fix cmake test quotes

* Build rust wasm before cmake tests

* Pass CTEST_OUTPUT_ON_FAILURE

* Another cmake test

* Handle os differences in cmake test

* Fix bugs in memory and multimemory examples

examples/gcd.c

@@ -15,6 +15,10 @@ You can compile and run this example on Linux with:
 
 Note that on Windows and macOS the command will be similar, but you'll need
 to tweak the `-lpthread` and such annotations.
+
+You can also build using cmake:
+
+mkdir build && cd build && cmake .. && cmake --build . --target wasmtime-gcd
 */
 
 #include <assert.h>