remove unused

visualc/how-to-fftw.txt

@@ -1,32 +0,0 @@
-../../fftw-3.3.4-dll32 and ../../fftw-3.3.4-dll64
-are the places to deploy the appropriate 32/64 bit version
-of the fftw3 libraries under VC++ which can be found here:
-
- http://www.fftw.org/install/windows.html
-
-More precisely (here in case of the 32 bit version),
- - you have to create the directory ../../fftw-3.3.4-dll32
-    (which is side by side and thus outside of the ngspice source tree)
- - you have to fetch fftw-3.3.4-dll32.zip and deploy it there
- - you have to unpack this .zip there
-
-At least you need to unpack these three files
-  fftw3.h
-  libfftw3-3.dll
-  libfftw3-3.def
-
-Then use vngspice-fftw.vcxproj to compile ngspice
-
-If you need to distribute ngspice.exe to another directory,
-copy the appropriate libfftw3-3.dll into the same directory or 
-to a place which is in your PATH environment.
-
-----
-
-(compile
-  "url=ftp://ftp.fftw.org/pub/fftw
-       for i in fftw-3.3.4-dll32 fftw-3.3.4-dll64 ; do
-           dst=../../$i
-           mkdir -p $dst
-           (cd $dst && wget $url/$i.zip && unzip $i.zip)
-       done")