[gcalctool] Add "yards" as a unit.

[Robin Sonefors <rsonefors src gnome org>]

commit d3862a5309e00d312512e2396ab9546c36b86948
Author: Robin Sonefors <ozamosi flukkost nu>
Date:   Tue Oct 19 10:11:37 2010 +0200

    Add "yards" as a unit.
    
    The gui conversion tool was already using the plural form, and since all
    other units have plural forms, yard needed one as well.

 src/mp-equation.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/mp-equation.c b/src/mp-equation.c
index 56acf22..d09c64e 100644
--- a/src/mp-equation.c
+++ b/src/mp-equation.c
@@ -311,6 +311,7 @@ convert(MPEquationParserState *state, const MPNumber *x, const char *x_units, co
         {"meters",                     "1"},
         {"m",                          "1"},
         {"yard",                       "0.9144"},
+        {"yards",                      "0.9144"},
         {"yd",                         "0.9144"},
         {"foot",                       "0.3048"},
         {"feet",                       "0.3048"},