Kernel: Replace i386 with i686

I don't really want to be working with i386 since it doesn't support
compare exchange instruction

LibELF/LibELF/LoadableELF.cpp

@@ -86,7 +86,7 @@ namespace LibELF
 			return BAN::Error::from_errno(ENOEXEC);
 		}
 
-#if ARCH(i386)
+#if ARCH(i686)
 		if (m_file_header.e_ident[EI_CLASS] != ELFCLASS32)
 #elif ARCH(x86_64)
 		if (m_file_header.e_ident[EI_CLASS] != ELFCLASS64)

LibELF/include/LibELF/ELF.h

@@ -42,7 +42,7 @@ namespace LibELF
 		const Elf32SectionHeader& section_header32(size_t) const;
 		const char* lookup_section_name32(uint32_t) const;
 		const char* lookup_string32(size_t, uint32_t) const;
-#if ARCH(i386)
+#if ARCH(i686)
 		const Elf32FileHeader& file_header_native() const { return file_header32(); }
 		const Elf32ProgramHeader& program_header_native(size_t index) const { return program_header32(index); }
 		const Elf32SectionHeader& section_header_native(size_t index) const { return section_header32(index); }

LibELF/include/LibELF/Types.h

@@ -155,7 +155,7 @@ namespace LibELF
 		Elf64Xword p_align;
 	};
 
-#if ARCH(i386)
+#if ARCH(i686)
 	using ElfNativeAddr = Elf32Addr;
 	using ElfNativeOff = Elf32Off;
 	using ElfNativeHalf = Elf32Half;