The install_manifest.txt is actually in the top-level binary directory, not the project-specific binary directory.  I get the CMake error 'Cannot find install manifest' if I've added the glew library as a subdirectory in my existing CMake project.

Include description of glew in README.md

Description has been taken from glew.sourceforge.net

Adding conan packaging support

add sudo make uninstall for cmake build

Add VERSION and SOVERSION number to shared libraries

With this commit, when building or installing `glew`, VERSION and
SOVERSION symlinks to the `glew` shared library are created in the
library installation folder if the platform supports them and the linker
supports so-names.
VERSION and SOVERSION specify, respectively, the build version and API
version of the shared library.

As an example, under macOS, the following symlinks will be created:
libGLEW.2.0.0.dylib                      (the shared library)
libGLEW.2.0.dylib -> libGLEW.2.0.0.dylib (VERSION symlink)
libGLEW.dylib -> libGLEW.2.0.dylib       (SOVERSION symlink)

Fixes #141

glewinfo output is a .txt file

Fix perl @INC for scripts which include make.pl

In perl 5.26, and some earlier perls that have been proactively
patched (Debian's perl 5.24, for example), '.' was removed from @INC
for security reasons.  For details, see:
  http://blogs.perl.org/users/todd_rinaldo/2016/11/how-removing-from-inc-is-about-to-break-cpan.html
  https://www.masteringperl.org/2017/01/perl-v5-26-removes-from-inc-but-dont-think-youre-safe/
et cetera.

This breaks the generation scripts which source make.pl with
  do 'bin/make.pl'

Although this might be indicative that it's time to refactor these
scripts, I opted for the simplest possible fix for now: restoring '.'
to @INC in each script that depends on make.pl.