Add rlibc dependency where needed to example kernels

Author: phil-opp

example-kernels/runner-doctest/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 bootloader = "0.9.7"
 x86_64 = "0.11.0"
+rlibc = "1.0.0"
 
 [package.metadata.bootimage]
 test-success-exit-code = 33 # (0x10 << 1) | 1

example-kernels/runner-doctest/src/lib.rs

@@ -4,6 +4,8 @@
 #![test_runner(crate::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 
+extern crate rlibc;
+
 /// add two numbers
 ///
 /// ```

example-kernels/runner-test/Cargo.toml

@@ -11,6 +11,7 @@ harness = false
 [dependencies]
 bootloader = "0.9.7"
 x86_64 = "0.11.0"
+rlibc = "1.0.0"
 
 [package.metadata.bootimage]
 test-success-exit-code = 33 # (0x10 << 1) | 1

example-kernels/runner-test/src/lib.rs

@@ -5,6 +5,8 @@
 #![test_runner(crate::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 
+extern crate rlibc;
+
 pub fn test_runner(tests: &[&dyn Fn()]) {
     for test in tests.iter() {
         test();