babl.spec: add chrpath in BuildRequires

previous commit (ffc26f8) introduce chrpath in install section.
To avoid build issue which means someone didn't buid with OBS
can buid this pack successfully, add chrpath to BuildRequires
like other spec did.

Signed-off-by: Chenxi Mao <chenxi.mao@suse.com>

babl.spec

@@ -1,12 +1,12 @@
 Name:          babl
 Version:       0.1.56
-Release:       5
+Release:       6
 Summary:       Pixel encoding and color space conversion engine in C
 License:       LGPLv3+ and GPLv3+
 URL:           http://www.gegl.org/babl/
 Source0:       https://download.gimp.org/pub/babl/0.1/%{name}-%{version}.tar.bz2
 
-BuildRequires: librsvg2, automake, autoconf, gcc
+BuildRequires: librsvg2, automake, autoconf, gcc, chrpath
 
 %description
 babl is pixel encoding and color space conversion engine in C. It allows converting between
@@ -73,6 +73,9 @@ make check
 %doc %{_docdir}/%{name}-devel/html
 
 %changelog
+* Thu Oct 28 2021 Chenxi Mao <chenxi.mao@suse.com> - 0.1.56-6
+- Add chrpath in BuildRequires
+
 * Wed Sep 9 2021 caodongxia <caodongxia@huawei.com> - 0.1.56-5
 - Remove rpath