feat(patch_bin): no patching if no libc

Using suggestion from `woutvanderploeg` to not patch if there is no libc present.

Mentioned io12#309

Author: bliutech

src/patch_bin.rs

@@ -124,8 +124,9 @@ fn bin_patched_path_from_bin(bin: &Path) -> Result<PathBuf> {
 }
 
 /// Add "_patched" to the end of the binary file name if the binary got patched.
+/// Skip if there is no libc or if the user disabled patching.
 pub fn bin_patched_path(opts: &Opts) -> Option<PathBuf> {
-    match opts.no_patch_bin {
+    match opts.no_patch_bin || opts.libc.is_none() {
         true => None,
         false => opts
             .bin

src/pwninit.rs

@@ -49,7 +49,8 @@ pub fn run(opts: Opts) -> Result {
 
     set_ld_exec(&opts).context(SetLdExecSnafu)?;
 
-    if !opts.no_patch_bin {
+    // Skip if there is no libc.
+    if !opts.no_patch_bin && opts.libc.is_some() {
         patch_bin::patch_bin(&opts).context(PatchBinSnafu)?;
     }