linux_examples/modules: add a module which dumps x86 CPU registers and tables
c_examples/dirs_to_cwd: fix -Wformat warning in 32-bit compilation

st.st_dev is an 64bit long integer, which is "long long" type in 32-bit
GCC.  Use the appropriate printf format for this field, and remove
-pedantic from the compilation flags as C90 does not support "%llu"
format.