Fix compilation for netbsd-9.2

$ rustc -V
rustc 1.52.1
$ cargo -V
cargo 1.52.0

Pre-requisite steps needed for build:
- Needed to install mozilla certs
- Needed to set OPENSSL_DIR=/usr

melib/src/datetime.rs

@@ -73,22 +73,34 @@ extern "C" {
     fn gettimeofday(tv: *mut libc::timeval, tz: *mut libc::timezone) -> i32;
 }
 
+#[cfg(not(target_os = "netbsd"))]
 struct Locale {
     new_locale: libc::locale_t,
     old_locale: libc::locale_t,
 }
+#[cfg(target_os = "netbsd")]
+struct Locale {
+    mask: std::os::raw::c_int,
+    old_locale: *const std::os::raw::c_char,
+}
 
 impl Drop for Locale {
     fn drop(&mut self) {
+        #[cfg(not(target_os = "netbsd"))]
         unsafe {
             let _ = libc::uselocale(self.old_locale);
             libc::freelocale(self.new_locale);
         }
+        #[cfg(target_os = "netbsd")]
+        unsafe {
+            let _ = libc::setlocale(self.mask, self.old_locale);
+        }
     }
 }
 
 // How to unit test this? Test machine is not guaranteed to have non-english locales.
 impl Locale {
+    #[cfg(not(target_os = "netbsd"))]
     fn new(
         mask: std::os::raw::c_int,
         locale: *const std::os::raw::c_char,
@@ -108,6 +120,25 @@ impl Locale {
             old_locale,
         })
     }
+    #[cfg(target_os = "netbsd")]
+    fn new(
+        mask: std::os::raw::c_int,
+        locale: *const std::os::raw::c_char,
+        _base: libc::locale_t,
+    ) -> Result<Self> {
+        let old_locale = unsafe { libc::setlocale(mask, std::ptr::null_mut()) };
+        if old_locale.is_null() {
+            return Err(nix::Error::last().into());
+        }
+        let new_locale = unsafe { libc::setlocale(mask, locale) };
+        if new_locale.is_null() {
+            return Err(nix::Error::last().into());
+        }
+        Ok(Locale {
+            mask,
+            old_locale,
+        })
+    }
 }
 
 pub fn timestamp_to_string(timestamp: UnixTimestamp, fmt: Option<&str>, posix: bool) -> String {

melib/src/lib.rs

@@ -181,6 +181,7 @@ pub mod shellexpand {
     use smallvec::SmallVec;
     use std::ffi::OsStr;
     use std::os::unix::ffi::OsStrExt;
+    #[cfg(not(target_os = "netbsd"))]
     use std::os::unix::io::AsRawFd;
     use std::path::{Path, PathBuf};
 

src/conf.rs

@@ -1154,7 +1154,7 @@ identity="username@hostname.local"
             let mut buf = [0u8; 16];
             f.read_exact(&mut buf)?;
             let mut filename = String::with_capacity(2 * 16);
-            for byte in buf {
+            for byte in &buf {
                 write!(&mut filename, "{:02X}", byte).unwrap();
             }
             let mut path = std::env::temp_dir();