Prevents mech RCD from being used with mesons, doubles R-wall deconstruction time (#88589)

## About The Pull Request

Mech RCD has a unique quality of being usable at range, but does not
check for LoS which allows you to instantly bore holes in multilayered
walls with no warning. R-walls won't save you either, since they can be
deconstructed by it just fine. Now, mech RCDs need LoS on turfs you
click and deconstructs r-walls twice as slowly (the same time it'd take
a normal RCD to deconstruct a normal wall).

## Why It's Good For The Game


![mech_rcd](https://github.com/user-attachments/assets/c10a1ad1-23f4-4da7-8a65-5dc110a74099)

Screen from a recent round - this can be done in 6 seconds, as with
correct mech positioning that's as long as you need to deconstruct all
the walls and doors. This is incredibly oppressive and I won't be
surprised if this started getting abused like hell. This should prevent
further issues while still keeping it a good (but not absurdly
overpowered) option for when you need to breach into somewhere, since
its still quicker (and safer) than thermite.

## Changelog
🆑
balance: Mech-mounted RCD no longer has wallhacks
balance: Reinforced walls now take double the time to get deconstructed
when using an RCD
/🆑

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/__DEFINES/construction/rcd.dm

@@ -51,3 +51,6 @@
 #define RCD_MEMORY_COST_BUFF 8
 /// If set to TRUE in rcd_vals, will bypass the cooldown on slowing down frequent use
 #define RCD_RESULT_BYPASS_FREQUENT_USE_COOLDOWN "bypass_frequent_use_cooldown"
+
+/// How much longer does it take to deconstruct rwalls?
+#define RCD_RWALL_DELAY_MULT 2