corrected ARM program entry point arithmetic

there was an assumption that the entry point would be in .text rather
than using the section information in the symbol

Author: JetSetIlly

hardware/memory/cartridge/elf/memory.go

@@ -694,15 +694,7 @@ func (mem *elfMemory) runInitialisation(arm *arm.ARM) error {
 	// the elf.File structure is no good for our purposes
 	for _, s := range mem.symbols {
 		if s.Name == "main" || s.Name == "elf_main" {
-			// ".text.main" is emitted by the rust compiler, while ".text" is emitted by GCC
-			// there must be a more robust way of finding the principal section
-			sec, ok := mem.sectionsByName[".text.main"]
-			if !ok {
-				sec, ok = mem.sectionsByName[".text"]
-				if !ok {
-					return fmt.Errorf("ELF: could not find .text section")
-				}
-			}
+			sec := mem.sections[s.Section]
 			mem.resetPC = sec.origin + uint32(s.Value)
 			mem.resetPC &= 0xfffffffe
 			break // for loop