Fix build on Ruby 1.9.x without pkgconfig file

Thanks to Slavek Banko.
(cherry picked from commit fc0c74f642)

configure.in

@@ -1548,9 +1548,12 @@ if test "x$compile_kross" = "xyes" ; then
       RUBY_VERSION=`$PKGCONFIG ruby --modversion 2>/dev/null`
       if test -n "$RUBY_VERSION"; then
         RUBY_CFLAGS=`$PKGCONFIG ruby --cflags`
-      else
+      fi
+      if test -z "$RUBY_VERSION"; then
         RUBY_VERSION=`$PKGCONFIG ruby-1.9 --modversion 2>/dev/null`
-        RUBY_CFLAGS=`$PKGCONFIG ruby-1.9 --cflags`
+        if test -n "$RUBY_VERSION"; then
+          RUBY_CFLAGS=`$PKGCONFIG ruby-1.9 --cflags`
+        fi
       fi
       if test -z "$RUBY_VERSION"; then
         # pkgconfig file does not exist but might be 1.9.1: RUBY_VERSION defined in ruby/version.h
@@ -1561,6 +1564,8 @@ if test "x$compile_kross" = "xyes" ; then
           RUBY_TEENY=`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"['TEENY']"@:>@)'`
           if test "$RUBY_MAJOR" == "1" && test "$RUBY_MINOR" == "9"; 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"
           fi
         fi
       fi

lib/kross/configure.in.in

@@ -34,9 +34,12 @@ if test "x$compile_kross" = "xyes" ; then
       RUBY_VERSION=`$PKGCONFIG ruby --modversion 2>/dev/null`
       if test -n "$RUBY_VERSION"; then
         RUBY_CFLAGS=`$PKGCONFIG ruby --cflags`
-      else
+      fi
+      if test -z "$RUBY_VERSION"; then
         RUBY_VERSION=`$PKGCONFIG ruby-1.9 --modversion 2>/dev/null`
-        RUBY_CFLAGS=`$PKGCONFIG ruby-1.9 --cflags`
+        if test -n "$RUBY_VERSION"; then
+          RUBY_CFLAGS=`$PKGCONFIG ruby-1.9 --cflags`
+        fi
       fi
       if test -z "$RUBY_VERSION"; then
         # pkgconfig file does not exist but might be 1.9.1: RUBY_VERSION defined in ruby/version.h
@@ -47,6 +50,8 @@ if test "x$compile_kross" = "xyes" ; then
           RUBY_TEENY=`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"['TEENY']"@:>@)'`
           if test "$RUBY_MAJOR" == "1" && test "$RUBY_MINOR" == "9"; 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"
           fi
         fi
       fi