Rename preprocessor directory.
-rw-r--r-- 313 .gitignore
drwxr-xr-x - APIs
-rw-r--r-- 1094 Makefile.am
-rw-r--r-- 247 README
-rw-r--r-- 1805 configure.ac
drwxr-xr-x - generator-lib
drwxr-xr-x - generator-macros
drwxr-xr-x - generator
drwxr-xr-x - lib
drwxr-xr-x - m4