Replace `echo -n` with `printf` and fix a message typo in autogen.sh

`echo -n` is not standardized and does not work as expected on POSIX-compliant operating systems such as Mac OS X 10.5 and later.

Output before:

```
-n checking for autogen ... 
yes
-n checking for autoconf ... 
yes
-n checking for automake ... 
yes
-n checking for libtool ... 
glibtoolize
-n checking for pkg-config ... 
yes
-n checking for python ... 
yes
Createing 'Cfg' directory.
```

Output after:

```
checking for autogen ... yes
checking for autoconf ... yes
checking for automake ... yes
checking for libtool ... glibtoolize
checking for pkg-config ... yes
checking for python ... yes
Creating 'Cfg' directory.
```