Provide symlinks to go and gofmt

Since we don't use update-alternatives, make gcc-go always provide
the symlinks. Checks that such binaries don't yet exist. This makes
it possible to have gcc-go and go installed at the same time.
This assumes that Go packages them as regular files, not symlinks.

cross-aarch64-gcc.spec

@@ -1413,6 +1413,26 @@ if posix.access ("/sbin/ldconfig", "x") then
   end
 end
 
+%post go
+pushd %{_bindir}
+if [ ! -f go ] ; then
+  ln -s go.gcc go
+fi
+if [ ! -f gofmt ] ; then
+  ln -s gofmt.gcc gofmt
+fi
+popd
+
+%preun go
+pushd %{_bindir}
+if [ -L go ]; then
+  rm go
+fi
+if [ -L gofmt ]; then
+  rm gofmt
+fi
+popd
+
 %post -n libstdc++ -p /sbin/ldconfig
 
 %postun -n libstdc++ -p /sbin/ldconfig

cross-armv7hl-gcc.spec

@@ -1413,6 +1413,26 @@ if posix.access ("/sbin/ldconfig", "x") then
   end
 end
 
+%post go
+pushd %{_bindir}
+if [ ! -f go ] ; then
+  ln -s go.gcc go
+fi
+if [ ! -f gofmt ] ; then
+  ln -s gofmt.gcc gofmt
+fi
+popd
+
+%preun go
+pushd %{_bindir}
+if [ -L go ]; then
+  rm go
+fi
+if [ -L gofmt ]; then
+  rm gofmt
+fi
+popd
+
 %post -n libstdc++ -p /sbin/ldconfig
 
 %postun -n libstdc++ -p /sbin/ldconfig

cross-i486-gcc.spec

@@ -1413,6 +1413,26 @@ if posix.access ("/sbin/ldconfig", "x") then
   end
 end
 
+%post go
+pushd %{_bindir}
+if [ ! -f go ] ; then
+  ln -s go.gcc go
+fi
+if [ ! -f gofmt ] ; then
+  ln -s gofmt.gcc gofmt
+fi
+popd
+
+%preun go
+pushd %{_bindir}
+if [ -L go ]; then
+  rm go
+fi
+if [ -L gofmt ]; then
+  rm gofmt
+fi
+popd
+
 %post -n libstdc++ -p /sbin/ldconfig
 
 %postun -n libstdc++ -p /sbin/ldconfig

cross-x86_64-gcc.spec

@@ -1413,6 +1413,26 @@ if posix.access ("/sbin/ldconfig", "x") then
   end
 end
 
+%post go
+pushd %{_bindir}
+if [ ! -f go ] ; then
+  ln -s go.gcc go
+fi
+if [ ! -f gofmt ] ; then
+  ln -s gofmt.gcc gofmt
+fi
+popd
+
+%preun go
+pushd %{_bindir}
+if [ -L go ]; then
+  rm go
+fi
+if [ -L gofmt ]; then
+  rm gofmt
+fi
+popd
+
 %post -n libstdc++ -p /sbin/ldconfig
 
 %postun -n libstdc++ -p /sbin/ldconfig

gcc.spec

@@ -1412,6 +1412,26 @@ if posix.access ("/sbin/ldconfig", "x") then
   end
 end
 
+%post go
+pushd %{_bindir}
+if [ ! -f go ] ; then
+  ln -s go.gcc go
+fi
+if [ ! -f gofmt ] ; then
+  ln -s gofmt.gcc gofmt
+fi
+popd
+
+%preun go
+pushd %{_bindir}
+if [ -L go ]; then
+  rm go
+fi
+if [ -L gofmt ]; then
+  rm gofmt
+fi
+popd
+
 %post -n libstdc++ -p /sbin/ldconfig
 
 %postun -n libstdc++ -p /sbin/ldconfig