userland: make libs work

Working for build, but now test-user-mode-in-tree is not using --in-tree,
TODO fix later on.

userland/cpp/bst_vs_heap.cpp

@@ -1,4 +1,4 @@
-/* https://github.com/cirosantilli/linux-kernel-module-cheat#bst-vs-heap */
+// https://github.com/cirosantilli/linux-kernel-module-cheat#bst-vs-heap
 
 #include <algorithm>
 #include <iostream>

userland/cpp/hello.cpp

@@ -1,4 +1,4 @@
-/* https://github.com/cirosantilli/linux-kernel-module-cheat#sanity-checks */
+// https://github.com/cirosantilli/linux-kernel-module-cheat#sanity-checks
 
 #include <iostream>
 

userland/libs/eigen/hello.cpp

@@ -1,6 +1,5 @@
-/* https://github.com/cirosantilli/linux-kernel-module-cheat#eigen
- * Adapted from: https://eigen.tuxfamily.org/dox/GettingStarted.html
- */
+// https://github.com/cirosantilli/linux-kernel-module-cheat#eigen
+// Adapted from: https://eigen.tuxfamily.org/dox/GettingStarted.html
 
 #include <iostream>
 

userland/libs/openblas/hello.c

@@ -5,7 +5,7 @@
 #include <assert.h>
 #include <cblas.h>
 
-#include <lkmc.h>
+#include <lkmc/math.h>
 
 int main(void) {
     double A[6] = {