[[BlueZ] ] mesh-gatt: Fix JSON files missing from dist

Moving EXTRA_DIST into a conditional means that if the dist isn't made
with the deprecated tools enabled, then files will be missing from the
distribution.

Fixes: 1f6553edd8a5c ("build: Deprecate meshctl tool")
---
 Makefile.tools | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

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Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=826064

---Test result---

Test Summary:
CheckPatch                    FAIL      0.50 seconds
GitLint                       PASS      0.22 seconds
BuildEll                      PASS      24.12 seconds
BluezMake                     PASS      704.47 seconds
MakeCheck                     PASS      11.79 seconds
MakeDistcheck                 PASS      165.83 seconds
CheckValgrind                 PASS      227.25 seconds
CheckSmatch                   PASS      330.46 seconds
bluezmakeextell               PASS      107.33 seconds
IncrementalBuild              PASS      665.70 seconds
ScanBuild                     PASS      956.84 seconds

Details
##############################
Test: CheckPatch - FAIL
Desc: Run checkpatch.pl script
Output:
[[BlueZ] ] mesh-gatt: Fix JSON files missing from dist
WARNING:BAD_FIXES_TAG: Please use correct Fixes: style 'Fixes: <12 chars of sha1> ("<title line>")' - ie: 'Fixes:  ("build: Deprecate meshctl tool")'
#50: 
Fixes: 1f6553edd8a5c ("build: Deprecate meshctl tool")

WARNING:UNKNOWN_COMMIT_ID: Unknown commit id '1f6553edd8a5c', maybe rebased or not pulled?
#50: 
Fixes: 1f6553edd8a5c ("build: Deprecate meshctl tool")

/github/workspace/src/src/13556710.patch total: 0 errors, 2 warnings, 10 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

/github/workspace/src/src/13556710.patch has style problems, please review.

NOTE: Ignored message types: COMMIT_MESSAGE COMPLEX_MACRO CONST_STRUCT FILE_PATH_CHANGES MISSING_SIGN_OFF PREFER_PACKED SPDX_LICENSE_TAG SPLIT_STRING SSCANF_TO_KSTRTO

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.


Use of uninitialized value $cid in concatenation (.) or string at /usr/bin/checkpatch.pl line 3196.


---
Regards,
Linux Bluetooth