Add mipsel maintainer

Author: LukasWoodtli

src/doc/rustc/src/SUMMARY.md

@@ -65,6 +65,7 @@
     - [m68k-unknown-none-elf](platform-support/m68k-unknown-none-elf.md)
     - [mips64-openwrt-linux-musl](platform-support/mips64-openwrt-linux-musl.md)
     - [mipsel-sony-psx](platform-support/mipsel-sony-psx.md)
+    - [mipsel-unknown-linux-gnu](platform-support/mipsel-unknown-linux-gnu.md)
     - [mips\*-mti-none-elf](platform-support/mips-mti-none-elf.md)
     - [mipsisa\*r6\*-unknown-linux-gnu\*](platform-support/mips-release-6.md)
     - [nvptx64-nvidia-cuda](platform-support/nvptx64-nvidia-cuda.md)

src/doc/rustc/src/platform-support.md

@@ -334,7 +334,7 @@ target | std | host | notes
 `mips64el-unknown-linux-muslabi64` | ✓ |  | MIPS64 (little endian) Linux, N64 ABI, musl 1.2.3
 `mipsel-sony-psp` | * |  | MIPS (LE) Sony PlayStation Portable (PSP)
 [`mipsel-sony-psx`](platform-support/mipsel-sony-psx.md) | * |  | MIPS (LE) Sony PlayStation 1 (PSX)
-`mipsel-unknown-linux-gnu` | ✓ | ✓ | MIPS (little endian) Linux (kernel 4.4, glibc 2.23)
+[`mipsel-unknown-linux-gnu`](platform-support/mipsel-unknown-linux-gnu.md) | ✓ | ✓ | MIPS (little endian) Linux (kernel 4.4, glibc 2.23)
 `mipsel-unknown-linux-musl` | ✓ |  | MIPS (little endian) Linux with musl 1.2.3
 `mipsel-unknown-linux-uclibc` | ✓ |  | MIPS (LE) Linux with uClibc
 [`mipsel-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | 32-bit MIPS (LE), requires mips32 cpu support

src/doc/rustc/src/platform-support/mipsel-unknown-linux-gnu.md

@@ -0,0 +1,28 @@
+# `mipsel-unknown-linux-gnu`
+
+**Tier: 3**
+
+Little-endian 32 bit MIPS for Linux with `glibc.
+
+## Target maintainers
+
+- [@LukasWoodtli](https://github.com/LukasWoodtli)
+
+## Requirements
+
+The target supports std on Linux. Host tools are supported but not tested.
+
+
+## Building the target
+
+For cross compilation the GNU C compiler for the mipsel architecture needs to
+be installed. On Ubuntu install the packets: `gcc-mipsel-linux-gnu` and
+`g++-mipsel-linux-gnu`.
+
+Add `mipsel-unknown-linux-gnu` as `target` list in `config.toml`.
+
+## Building Rust programs
+
+Rust does not ship pre-compiled artifacts for this target. To compile for
+this target, you will need to build Rust with the target enabled (see
+"Building the target" above).