chore: remove commented out _exit.c and sys_exit.c entries

Clean up by removing commented code instead of keeping dead comments.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: luoliwoshang

internal/crosscompile/compile/libc/newlibesp.go

@@ -93,7 +93,6 @@ func getNewlibESP32ConfigRISCV(baseDir, target string) compile.CompileConfig {
 					filepath.Join(baseDir, "libgloss", "libnosys", "wait.c"),
 					filepath.Join(baseDir, "libgloss", "libnosys", "write.c"),
 					filepath.Join(baseDir, "libgloss", "libnosys", "getentropy.c"),
-					// filepath.Join(baseDir, "libgloss", "libnosys", "_exit.c"),
 					filepath.Join(baseDir, "libgloss", "libnosys", "getreent.c"),
 					filepath.Join(baseDir, "libgloss", "libnosys", "time.c"),
 					filepath.Join(baseDir, "libgloss", "libnosys", "fcntl.c"),
@@ -233,7 +232,6 @@ func getNewlibESP32ConfigRISCV(baseDir, target string) compile.CompileConfig {
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_close.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_conv_stat.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_execve.c"),
-					// filepath.Join(baseDir, "libgloss", "riscv", "sys_exit.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_faccessat.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_fork.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_fstat.c"),
@@ -266,7 +264,6 @@ func getNewlibESP32ConfigRISCV(baseDir, target string) compile.CompileConfig {
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_close.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_conv_stat.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_execve.c"),
-					// filepath.Join(baseDir, "libgloss", "riscv", "sys_exit.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_faccessat.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_fork.c"),
 					filepath.Join(baseDir, "libgloss", "riscv", "sys_fstat.c"),