Rebuild to fix GCC 8 mis-compilation

See https://da.gd/YJVwk ("GCC 8 ABI change on x86_64")

pngquant.spec

@@ -2,7 +2,7 @@
 
 Name:           pngquant
 Version:        2.11.7
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        PNG quantization tool for reducing image file size
 
 License:        GPLv3+
@@ -55,6 +55,10 @@ export CFLAGS="%{optflags} -fno-math-errno -funroll-loops -fomit-frame-pointer -
 
 
 %changelog
+* Wed Mar 07 2018 Adam Williamson <awilliam@redhat.com> - 2.11.7-4
+- Rebuild to fix GCC 8 mis-compilation
+  See https://da.gd/YJVwk ("GCC 8 ABI change on x86_64")
+
 * Fri Feb 09 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.11.7-3
 - Escape macros in %%changelog