Add Elbrus 2000 architecture (#19024)

* Add Elbrus 2000 architecture

* Add e2k to niminst

* Update compiler/installer.ini

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

tools/nim.zsh-completion

@@ -74,6 +74,7 @@ _nim() {
     '*--cpu=arm64[compile for ARM64 architecture]' \
     '*--cpu=avr[compile for AVR architecture]' \
     '*--cpu=esp[compile for ESP architecture]' \
+    '*--cpu=e2k[compile for Elbrus 2000 architecture]' \
     '*--cpu=hppa[compile for HPPA architecture]' \
     '*--cpu=i386[compile for i386 architecture]' \
     '*--cpu=ia64[compile for ia64 architecture]' \

tools/niminst/buildsh.nimf

@@ -227,6 +227,8 @@ case $ucpu in
     mycpu="arm" ;;
   *riscv64|riscv* )
     mycpu="riscv64" ;;
+  *e2k* )
+    mycpu="e2k" ;;
   *)
     echo 2>&1 "Error: unknown processor: $ucpu"
     exit 1

tools/niminst/makefile.nimf

@@ -166,6 +166,9 @@ endif
 ifeq ($(ucpu),riscv64)
   mycpu = riscv64
 endif
+ifeq ($(ucpu),e2k)
+  mycpu = e2k
+endif
 ifndef mycpu
   $(error unknown CPU architecture: $(ucpu) See makefile.nimf)
 endif