Add missing BuildRequires on gcc

make: cc: Command not found

References: https://bugzilla.redhat.com/show_bug.cgi?id=1606733
Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

xdotool.spec

@@ -8,6 +8,7 @@ License:        BSD
 URL:            http://www.semicomplete.com/projects/xdotool/
 Source0:        https://github.com/jordansissel/xdotool/archive/%{name}-%{version}.tar.gz
 
+BuildRequires:  gcc
 BuildRequires:  libXtst-devel, libX11-devel, libXinerama-devel, libXi-devel, /usr/bin/pod2man, libxkbcommon-devel
 
 %description