feature: Upgrade FPC from 2.6.4 to 3.2.2

Migrate the build toolchain from Free Pascal Compiler 2.6.4 to 3.2.2.
FPC 3.2.2 requires a significantly expanded custom system unit and
several syntactic adjustments across the codebase.

Dockerfile:
- Bump FPC_VERSION from 2.6.4 to 3.2.2

compile_sources.sh:
- Replace obsolete -Op3 flag with -OpPENTIUM3

linker.script:
- Add /DISCARD/ section for .init_array, .fini_array, .ctors, .dtors,
  .eh_frame, .gcc_except_table, and .note.GNU-stack sections emitted
  by FPC 3.2.2

system.pas:
- Fix hresult to 'type longint' (was cardinal, incompatible with 3.2.2)
- Add required types: SizeInt, SizeUInt, PtrInt, PtrUInt, NativeInt,
  NativeUInt, CodePointer, TTypeKind, jmp_buf, TExceptAddr, TGuid,
  FileRec, TextRec
- Add required globals: ExceptAddrStack, ExitCode, ErrorAddr, ErrorCode,
  ExitProc, StackBottom, StackLength, RandSeed
- Implement compilerprocs: fpc_initializeunits, fpc_do_exit,
  fpc_handleerror, fpc_rangeerror, fpc_overflow, fpc_divbyzero,
  fpc_objecterror, fpc_abstracterror, fpc_stackcheck, fpc_iocheck,
  fpc_pushexceptaddr, fpc_popaddrstack, fpc_setjmp (asm),
  fpc_longjmp (asm), fpc_shortstr_assign, fpc_mul_int64 (asm),
  fpc_getmem, fpc_freemem, fpc_reraise, fpc_raiseexception,
  fpc_catches, fpc_doneexception
- Add move() procedure with FPC_MOVE alias

util.pas, serial.pas:
- Fix inline asm functions (getESP, inl, inw, inb, sinb) to use temp
  variables instead of function-name result — FPC 3.2.2 no longer
  allows 'MOV funcname, reg' syntax in inline asm blocks

lmemorymanager.pas:
- Export kalloc/kfree with public aliases (kernel_kalloc, kernel_kfree)
  so system.pas fpc_getmem/fpc_freemem can link to them

src/driver/interface/serial.pas

@@ -58,16 +58,19 @@ begin
 end;
 
 function sinb(port : uint16) : uint8;
+var
+     tmp : uint8;
 begin
      asm
           PUSH EAX
           PUSH EDX
           MOV DX, port
           IN AL, DX
-          MOV sinb, AL
+          MOV tmp, AL
           POP EDX
           POP EAX
      end;
+     sinb := tmp;
      io_wait;
 end;
 

src/include/util.pas

@@ -130,10 +130,13 @@ begin
 end;
 
 function getESP : uint32;
+var
+    tmp: uint32;
 begin
     asm
-        MOV getESP, ESP
+        MOV tmp, ESP
     end;
+    getESP := tmp;
 end;
 
 function HexCharToDecimal(hex : char) : uint8;
@@ -362,6 +365,8 @@ begin
 end;
 
 function inl(port : uint16) : uint32; [public, alias: 'util_inl'];
+var
+     tmp : uint32;
 begin
      //serial.sendString('[inl]');
      //serial.sendHex(port);
@@ -370,14 +375,17 @@ begin
           PUSH EDX
           MOV DX, port
           IN EAX, DX
-          MOV inl, EAX
+          MOV tmp, EAX
           POP EDX
           POP EAX
      end;
+     inl := tmp;
      io_wait;
 end;
 
 function inw(port : uint16) : uint16; [public, alias: 'util_inw'];
+var
+     tmp : uint16;
 begin
      //serial.sendString('[inw]');
      //serial.sendHex(port);
@@ -386,14 +394,17 @@ begin
           PUSH EDX
           MOV DX, port
           IN AX, DX
-          MOV inw, AX
+          MOV tmp, AX
           POP EDX
           POP EAX
      end;
+     inw := tmp;
      io_wait;
 end;
 
 function inb(port : uint16) : uint8; [public, alias: 'util_inb'];
+var
+     tmp : uint8;
 begin
      //serial.sendString('[inb]');
      //serial.sendHex(port);
@@ -402,10 +413,11 @@ begin
           PUSH EDX
           MOV DX, port
           IN AL, DX
-          MOV inb, AL
+          MOV tmp, AL
           POP EDX
           POP EAX
      end;
+     inb := tmp;
      io_wait;
 end;
 

src/lmemorymanager.pas

@@ -170,7 +170,7 @@ begin
     klalloc:= Address;
 end;
 
-function kalloc(size : uint32) : void;
+function kalloc(size : uint32) : void; [public, alias: 'kernel_kalloc'];
 var
    Heap_Entries : uint32;
    i, j         : uint32;
@@ -217,7 +217,7 @@ begin
     //pop_trace;
 end;
 
-procedure kfree(area : void);
+procedure kfree(area : void); [public, alias: 'kernel_kfree'];
 var
     hp : PHeapPage;
     entry : uint32;