add explicit BR for the gcc compiler

... as instructed at:

https://fedoraproject.org/wiki/Packaging:C_and_C%2B%2B

findutils.spec

@@ -1,7 +1,7 @@
 Summary: The GNU versions of find utilities (find and xargs)
 Name: findutils
 Version: 4.6.0
-Release: 16%{?dist}
+Release: 17%{?dist}
 Epoch: 1
 License: GPLv3+
 Group: Applications/File
@@ -48,6 +48,7 @@ Provides: bundled(gnulib)
 BuildRequires: automake
 BuildRequires: dejagnu
 BuildRequires: gettext-devel
+BuildRequires: gcc
 BuildRequires: git
 BuildRequires: libselinux-devel
 BuildRequires: texinfo
@@ -139,6 +140,9 @@ fi
 %{_infodir}/find-maint.info.gz
 
 %changelog
+* Mon Feb 19 2018 Kamil Dudka <kdudka@redhat.com> - 1:4.6.0-17
+- add explicit BR for the gcc compiler
+
 * Mon Feb 12 2018 Kamil Dudka <kdudka@redhat.com> - 1:4.6.0-16
 - import gnulib's FTS module from upstream commit 281b825e (#1544429)