remove ABI patch

jbig2dec includes its own checks now (comparing the versions of the
dynamically linked library against that of the compile time headers),
rendering any attempty at cross version compatibility futile.

Rather than patching out this check, accept Artifex' approach and
coordinate jbig2dec updates via side-tags.

jbig2dec-0.17-Restore-ABI-compatibility.patch

@@ -1,18 +0,0 @@
-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 +1,10 @@
 Name:		jbig2dec
 Version:	0.19
-Release:	1%{?dist}
+Release:	2%{?dist}
 Summary:	A decoder implementation of the JBIG2 image compression format 
 License:	AGPLv3+
 URL:		http://jbig2dec.sourceforge.net/
 Source0:	https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs952/%{name}-%{version}.tar.gz
-Patch1:		jbig2dec-0.17-Restore-ABI-compatibility.patch
 Requires:	%{name}-libs = %{version}-%{release}
 BuildRequires:	libtool
 BuildRequires:	libpng-devel
@@ -81,6 +80,9 @@ rm -f %{buildroot}%{_libdir}/*.la
 
 
 %changelog
+* Fri Sep 18 2020 Michael J Gruber <mjg@fedoraproject.org> - 0.19-2
+- remove ABI patch (and coordinate builds)
+
 * Thu Sep 17 2020 Anna Khaitovich <akhaitov@redhat.com> - 0.19-1
 - Rebase to 0.19