Fix Ruby 1.9.x shared library test without pkgconfig file

(cherry picked from commit e566a4bef0)

configure.in

@@ -1566,6 +1566,9 @@ if test "x$compile_kross" = "xyes" ; then
             RUBY_VERSION="$RUBY_MAJOR.$RUBY_MINOR.$RUBY_TEENY"
             RUBY_CFLAGS="-I`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"rubyhdrdir"@:>@)'`"
             RUBY_CFLAGS="$RUBY_CFLAGS/`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"arch"@:>@)'` $RUBY_CFLAGS"
+            if test -n "`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"LIBRUBYARG_SHARED"@:>@)'`"; then
+              RUBY_ENABLESHARED=yes
+            fi
           fi
         fi
       fi
@@ -1602,6 +1605,7 @@ if test "x$compile_kross" = "xyes" ; then
     AC_SUBST(RUBY_SITEARCHDIR)
     AC_SUBST(RUBY_RUBYLIBDIR)
     AC_SUBST(RUBY_INCLUDEDIR)
+    AC_SUBST(RUBY_LIBRUBYARG)
     AC_SUBST(RUBY_SITEDIR)
     AC_SUBST(RUBY_CFLAGS)
 

lib/kross/configure.in.in

@@ -52,6 +52,9 @@ if test "x$compile_kross" = "xyes" ; then
             RUBY_VERSION="$RUBY_MAJOR.$RUBY_MINOR.$RUBY_TEENY"
             RUBY_CFLAGS="-I`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"rubyhdrdir"@:>@)'`"
             RUBY_CFLAGS="$RUBY_CFLAGS/`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"arch"@:>@)'` $RUBY_CFLAGS"
+            if test -n "`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"LIBRUBYARG_SHARED"@:>@)'`"; then
+              RUBY_ENABLESHARED=yes
+            fi
           fi
         fi
       fi
@@ -88,6 +91,7 @@ if test "x$compile_kross" = "xyes" ; then
     AC_SUBST(RUBY_SITEARCHDIR)
     AC_SUBST(RUBY_RUBYLIBDIR)
     AC_SUBST(RUBY_INCLUDEDIR)
+    AC_SUBST(RUBY_LIBRUBYARG)
     AC_SUBST(RUBY_SITEDIR)
     AC_SUBST(RUBY_CFLAGS)