guix: move *-check.py scripts under contrib/guix

These scripts are not meant for general developer usage. They are for
use on the release binaries, which have been compiled in an environment
that makes various assumptions in regards to c library, compiler
options, hardening options, patching etc.

depends/packages.md

@@ -6,7 +6,7 @@ The package "mylib" will be used here as an example
 General tips:
 - mylib_foo is written as $(package)_foo in order to make recipes more similar.
 - Secondary dependency packages relative to the bitcoin binaries/libraries (i.e.
-  those not in `ALLOWED_LIBRARIES` in `contrib/devtools/symbol-check.py`) don't
+  those not in `ALLOWED_LIBRARIES` in `contrib/guix/symbol-check.py`) don't
   need to be shared and should be built statically whenever possible. See
   [below](#secondary-dependencies) for more details.
 
@@ -184,7 +184,7 @@ the Autotools `--with-pic` flag, or `CMAKE_POSITION_INDEPENDENT_CODE` with CMake
 ## Secondary dependencies:
 
 Secondary dependency packages relative to the bitcoin binaries/libraries (i.e.
-those not in `ALLOWED_LIBRARIES` in `contrib/devtools/symbol-check.py`) don't
+those not in `ALLOWED_LIBRARIES` in `contrib/guix/symbol-check.py`) don't
 need to be shared and should be built statically whenever possible. This
 improves general build reliability as illustrated by the following example: