remove a duplicate dependency

Upstream-status: Pending

The install-rb-default dependency is as below:

pre-install-rb-default:
	mkdir -p $(RUBYLIBDIR)/bigdecimal

install-rb-default: pre-install-rb-default $(RUBYLIBDIR)/bigdecimal

In fact, dependency on $(RUBYLIBDIR)/bigdecimal is duplicate, and not rule
for $(RUBYLIBDIR)/bigdecimal, once $(RUBYLIBDIR)/bigdecimal is checked before
pre-install-rb-default, the below error will happen
	*** No rule to make target `../../.ext/common/yaml', needed by `install-rb-default'.  Stop

Signed-off-by: Roy Li <rongqing.li@windriver.com>
---
 lib/mkmf.rb |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 1f5ed76..556684c 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -2054,7 +2054,7 @@ static: $(STATIC_LIB)#{$extout ? " install-rb" : ""}
       end
       for f in files
         dest = "#{dir}/#{File.basename(f)}"
-        mfile.print("install-rb#{sfx}: #{dest} #{dir}\n")
+        mfile.print("install-rb#{sfx}: #{dest}\n")
         mfile.print("#{dest}: #{f}\n")
         mfile.print("\t$(Q) $(#{$extout ? 'COPY' : 'INSTALL_DATA'}) #{f} $(@D#{sep})\n")
         if defined?($installed_list) and !$extout
-- 
1.7.10.4