gnsstk: add new recipe

[valgur]

Adds a recipe for GNSSTk: https://github.com/SGL-UT/gnsstk

On Repology under the former GPSTk name:

[github-actions]

Hooks produced the following warnings for commit b0ca05b

gnsstk/14.0.0@#5626c5b0555b050d43cb7b17deeb51b3

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libgnsstk.so' links to system library 'm' but it is not in cpp_info.system_libs.

[github-actions]

Hooks produced the following warnings for commit 1929d43

gnsstk/14.0.0@#47964c95a74512e9a624013b53906188

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libgnsstk.so' links to system library 'm' but it is not in cpp_info.system_libs.

[github-actions]

Hooks produced the following warnings for commit 7314bed

gnsstk/14.0.0@#b239e71feb319a936028c29b4ec1e21d

post_package(): WARN: [APPLE RELOCATABLE SHARED LIBS (KB-H077)] install_name dir of these shared libs is not @rpath: libgnsstk.14.0.0.dylib, libgnsstk.14.dylib, libgnsstk.dylib

[github-actions]

Hooks produced the following warnings for commit aa71ff5

gnsstk/14.0.0@#8ff16f269c038ef54e6d27957f45aab8

post_package(): WARN: [APPLE RELOCATABLE SHARED LIBS (KB-H077)] install_name dir of these shared libs is not @rpath: libgnsstk.14.0.0.dylib, libgnsstk.14.dylib, libgnsstk.dylib

[github-actions]

Hooks produced the following warnings for commit 0fa2d26

gnsstk/14.3.0@#ff955439d8bfbf380979f8e515dda1fc

post_package(): WARN: [APPLE RELOCATABLE SHARED LIBS (KB-H077)] install_name dir of these shared libs is not @rpath: libgnsstk.14.dylib, libgnsstk.14.2.0.dylib, libgnsstk.dylib

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 3 (542d2b2a030d49bf3d587fe836b2ba8160dc7fbd):

• gnsstk/14.3.0:
  All packages built successfully! (All logs)

---

Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 3 (542d2b2a030d49bf3d587fe836b2ba8160dc7fbd):

• gnsstk/14.3.0:
  All packages built successfully! (All logs)