restore ABI-compatibilty (#1770160)

Patch from debian bug 940605

jbig2dec-0.17-Restore-ABI-compatibility.patch

@@ -0,0 +1,18 @@
+diff --git a/jbig2.c b/jbig2.c
+index 97018ea..17ffd72 100644
+--- a/jbig2.c
++++ b/jbig2.c
+@@ -99,6 +99,13 @@ jbig2_error(Jbig2Ctx *ctx, Jbig2Severity severity, int32_t segment_number, const
+     return -1;
+ }
+ 
++#undef jbig2_ctx_new
++Jbig2Ctx *
++jbig2_ctx_new(Jbig2Allocator *allocator, Jbig2Options options, Jbig2GlobalCtx *global_ctx, Jbig2ErrorCallback error_callback, void *error_callback_data)
++{
++    return jbig2_ctx_new_imp((allocator), (options), (global_ctx), (error_callback), (error_callback_data), JBIG2_VERSION_MAJOR, JBIG2_VERSION_MINOR);
++}
++
+ Jbig2Ctx *
+ jbig2_ctx_new_imp(Jbig2Allocator *allocator, Jbig2Options options, Jbig2GlobalCtx *global_ctx, Jbig2ErrorCallback error_callback, void *error_callback_data, int jbig2_version_major, int jbig2_version_minor)
+ {

jbig2dec.spec

@@ -1,11 +1,12 @@
 Name:           jbig2dec
 Version:        0.17
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A decoder implementation of the JBIG2 image compression format 
 
 License:        GPLv2
 URL:            http://jbig2dec.sourceforge.net/
 Source0:        https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs950/%{name}-%{version}.tar.gz
+Patch1:         jbig2dec-0.17-Restore-ABI-compatibility.patch
 BuildRequires:  libtool
 
 %description
@@ -43,7 +44,7 @@ which requires the jbig2dec library.
 
 
 %prep
-%setup -q
+%autosetup
 
 
 %build
@@ -79,6 +80,9 @@ rm -f %{buildroot}%{_libdir}/*.la
 
 
 %changelog
+* Sat Nov 09 2019 Michael J Gruber <mjg@fedoraproject.org> - 0.17-2
+- restore ABI-compatibilty (#1770160)
+
 * Thu Nov 07 2019 Michael J Gruber <mjg@fedoraproject.org> - 0.17-1
 - bugfix release (bz #1761919)