RISCOS: Don't force the use of dynamic areas on RISC OS 5

NEWS.md

@@ -21,6 +21,9 @@ For a more comprehensive changelog of the latest experimental code, see:
  HDB:
    - Fixed bug with inability to pick up red envelope with keyboard.
 
+ RISC OS port:
+   - Fixed crash on RISC OS 5 with games that require lots of RAM.
+
 
 #### 2.7.0 "The Real Slim Shader" (2023-02-26)
 

backends/plugins/riscos/riscos-provider.cpp

@@ -32,10 +32,6 @@
 #include <kernel.h>
 #include <swis.h>
 
-// By declaring this variable we force libunixlib to always use dynamic areas for data allocations
-// This frees up space for plugins and allows to have plenty of space for data
-const char *const __dynamic_da_name = "ScummVM Heap";
-
 // HACK: These two function are part of private API in libunixlib
 // They let allocate and free data in the application space where the stack is placed below 64MB
 // When using malloc with big chunks we end up in memory mapped areas above 64MB

dists/riscos/!Run,feb

@@ -12,6 +12,17 @@ RMEnsure DigitalRenderer 0.55 Error ScummVM requires DigitalRenderer 0.55 or lat
 
 Unset Alias$RMLoadIfThere
 
+| By setting ScummVM$Heap we force libunixlib to always use dynamic areas for data allocations
+| This frees up space for plugins and allows to have plenty of space for data
+Set HasLargeWimpSlot no
+RMEnsure UtilityModule 6.00 Set HasLargeWimpSlot yes
+RMEnsure UtilityModule 5.00 Set HasLargeWimpSlot no
+
+If "<HasLargeWimpSlot>" = "no" Then Set ScummVM$Heap ""
+If "<HasLargeWimpSlot>" = "no" Then SetEval ScummVM$HeapMax 128
+
+Unset HasLargeWimpSlot
+
 | If running from the desktop, redirect stdout and stderr to a file.
 | This shouldn't happen when running from the command line, so that commands like "<ScummVM$Dir> --help" still work as expected.
 Set Alias$Run_ScummVM Run <Obey$Dir>.scummvm %%*0 ><Choices$Write>.ScummVM.stdout 2><Choices$Write>.ScummVM.stderr