Bug#850277: src:glm: CMake detection fails on !x64

[Ghislain Antony Vaillant]

Package: src:glm
Severity: important

Dear Maintainer,

Following the recent RC bug affecting src:forge [1], it is now clear
that there is an issue with the CMake detection of glm (and potentially
other arch-indep packages, like gli) on non 64-bit platforms.

Any attempt to call `find_package(glm REQUIRED)` produces the following
error:

```
Could not find a configuration file for package "glm" that is
compatible with requested version "".

The following configuration files were considered but not accepted:

    /usr/lib/cmake/glm/glmConfig.cmake, version: 0.9.8 (64bit)
```

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850243

Best regards,
Ghis


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (900, 'testing'), (300, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.8.0-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)