Merge branch 'mr/fofanov/add-rust-ext' into 'master'

Add body suffix for Rust.

See merge request eng/gpr/gprconfig_kb!42

Author: t-14

db/0_default.xml

@@ -21,6 +21,8 @@
 
       for Body_Suffix ("Fortran") use ".f";
 
+      for Body_Suffix ("Rust") use ".rs";
+
       for Casing use "lowercase";
       for Dot_Replacement use "-";