Add partial support to use system libraries instead of ones downloaded and built off the network

[apteryks]

Hi,

This was motivated because I wanted to try to build Ogre with this, and to package something in Guix, it needs to be able to build in an isolated container (no internet). We also prefer to use (shared) system libraries, to save on build time and centralize maintenance.

I expect that to be useful to other distributions as well!

[apteryks]

I successfully built the package with this change using the following Guix package definition:

(define-public freeimagere
  (package
    (name "freeimagere")
    (version "4.2.0")
    (source (origin
              (method git-fetch)
              (uri (git-reference
                     (url "https://github.com/agruzdev/FreeImageRe")
                     (commit (string-append "v" version))))
              (file-name (git-file-name name version))
              (sha256
               (base32
                "17xl5y0zsg16i4ym6dgdlwyf3wa1warf45c84fgjpc9nx847k0ii"))
              (modules '((guix build utils)))
              (snippet '(delete-file-recursively "3rdParty"))))
    (build-system cmake-build-system)
    ;; The libjxr support depends on the bundled 3rdParty/LibJXR source.
    (arguments
     (list
      #:tests? #f                       ;also disabled upstream
      #:cmake cmake-minimal-4
      #:configure-flags
      #~(list
         "-DUSE_SYSTEM_LIBS=ON"
         "-DFREEIMAGE_WITH_LIBJXR=OFF"           ;relies on bundled 3rdParty
         "-DFREEIMAGE_WITH_LIBOPENJPEG=OFF"      ;not packaged
         "-DFREEIMAGE_WITH_LIBJPEGXL=OFF"        ;not packaged
         "-DFREEIMAGE_WITH_LIBJPEG_TRANSFORMS=OFF" ;requires private headers
         "-DFREEIMAGE_WITH_LIBTIFF=OFF")))         ;requires private headers
    (native-inputs (list pkg-config))
    (inputs
     (list libheif
           libjpeg-turbo
           libpng
           libraw
           libwebp
           openexr
           openjph
           yato
           zlib))
    (home-page "https://github.com/agruzdev/FreeImageRe")
    (synopsis "Library for handling popular graphics image formats")
    (description "FreeImage Re(surrected) is a fork of FreeImage, a library
that supports popular graphics image formats like PNG, BMP, JPEG, TIFF and
others.")
    (license (list license:gpl2+ license:gpl3+))))

This is with the following dependencies from Guix:

libheif@1.22.2 libjpeg-turbo@2.1.4 libpng@1.6.39 libraw@0.21.2 libwebp@1.3.2
+ openexr@3.2.4 openjph@0.27.3 pkg-config@0.29.2 yato@1.1-0.7999c10 zlib@1.3.1