[librsvg: 2/3] Bump the minimum rustc version to 1.21

[Jordan Petridis <jpetridis src gnome org>]

commit 2a12cbf6c5339b383da739593326e20fdbad0cb8
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Fri Mar 16 03:36:44 2018 +0200

    Bump the minimum rustc version to 1.21

 configure.ac | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4909b4dd..4a653d0d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,16 +80,13 @@ AS_IF(test x$RUSTC = xno,
 
 dnl Minimum version of rustc that we support
 MINIMUM_RUST_MAJOR=1
-MINIMUM_RUST_MINOR=20
+MINIMUM_RUST_MINOR=21
 
 rust_version=`rustc --version`
 version=`echo "$rust_version" | sed -e 's/^rustc //g'`
 major=`echo "$version" | cut -d. -f1`
 minor=`echo "$version" | cut -d. -f2`
 
-MINIMUM_RUST_MAJOR=1
-MINIMUM_RUST_MINOR=20
-
 AS_IF(test "$major" -lt "$MINIMUM_RUST_MAJOR" -o "$minor" -lt "$MINIMUM_RUST_MINOR",
     AC_MSG_ERROR([librsvg needs at rustc version at least $MINIMUM_RUST_MAJOR.$MINIMUM_RUST_MINOR])
 )