[librsvg] Remove unused function

[Federico Mena Quintero <federico src gnome org>]

commit a7c841025e4ca6bb7fa9ad4fbd7b710f63adf856
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Sep 24 17:08:59 2018 -0500

    Remove unused function

 librsvg/rsvg-css.h            |  6 +-----
 rsvg_internals/src/lib.rs     |  2 --
 rsvg_internals/src/parsers.rs | 35 -----------------------------------
 3 files changed, 1 insertion(+), 42 deletions(-)
---
diff --git a/librsvg/rsvg-css.h b/librsvg/rsvg-css.h
index aebc543e..0827812e 100644
--- a/librsvg/rsvg-css.h
+++ b/librsvg/rsvg-css.h
@@ -58,12 +58,8 @@ RsvgCssColorSpec rsvg_css_parse_color_ (const char *str);
 G_GNUC_INTERNAL
 RsvgCssColorSpec rsvg_css_parse_color (const char *str);
 
-/* Implemented in rust/src/parsers.rs */
-G_GNUC_INTERNAL
-gboolean rsvg_css_parse_number_optional_number (const char *str, double *out_x, double *out_y);
-
 #endif /* RSVG_COMPILATION */
 
 G_END_DECLS
 
-#endif  
+#endif
diff --git a/rsvg_internals/src/lib.rs b/rsvg_internals/src/lib.rs
index c7da7c78..d4ac2cd7 100644
--- a/rsvg_internals/src/lib.rs
+++ b/rsvg_internals/src/lib.rs
@@ -59,8 +59,6 @@ pub use tree::{
     rsvg_tree_root_is_svg,
 };
 
-pub use parsers::rsvg_css_parse_number_optional_number;
-
 pub use property_bag::{
     rsvg_property_bag_free,
     rsvg_property_bag_iter_begin,
diff --git a/rsvg_internals/src/parsers.rs b/rsvg_internals/src/parsers.rs
index 064a6c21..5bb1f6a0 100644
--- a/rsvg_internals/src/parsers.rs
+++ b/rsvg_internals/src/parsers.rs
@@ -1,14 +1,10 @@
 use cssparser::{BasicParseError, Parser, ParserInput, Token};
-use glib::translate::*;
-use glib_sys;
-use libc;
 
 use std::f64::consts::*;
 use std::str::{self, FromStr};
 
 use attributes::Attribute;
 use error::{NodeError, ValueErrorKind};
-use util::utf8_cstr;
 
 #[derive(Debug, Clone, PartialEq)]
 pub struct ParseError {
@@ -253,37 +249,6 @@ pub fn integer_optional_integer(s: &str) -> Result<(i32, i32), ValueErrorKind> {
     }
 }
 
-#[no_mangle]
-pub extern "C" fn rsvg_css_parse_number_optional_number(
-    s: *const libc::c_char,
-    out_x: *mut f64,
-    out_y: *mut f64,
-) -> glib_sys::gboolean {
-    assert!(!s.is_null());
-    assert!(!out_x.is_null());
-    assert!(!out_y.is_null());
-
-    let string = unsafe { utf8_cstr(s) };
-
-    match number_optional_number(string) {
-        Ok((x, y)) => {
-            unsafe {
-                *out_x = x;
-                *out_y = y;
-            }
-            true
-        }
-
-        Err(_) => {
-            unsafe {
-                *out_x = 0.0;
-                *out_y = 0.0;
-            }
-            false
-        }
-    }.to_glib()
-}
-
 // Parse a list-of-points as for polyline and polygon elements
 // https://www.w3.org/TR/SVG/shapes.html#PointsBNF