build: don't remove distributed stamp files on "make clean"

Those files are created by the maintainers and should remain after
"make clean" when the distribution tarball is used.

Reported by christian wagner in:
https://gitlab.com/gnutls/gnutls/-/issues/1088

Signed-off-by: Daiki Ueno <ueno@gnu.org>

diff --git a/doc/Makefile.am b/doc/Makefile.am
index ea2af3197663e17f1f9190143e275747b9228e25..e7d2b8d895f2a2e80a0dd39db510e7d81fca32f3 100644 (file)
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -210,10 +210,7 @@ API_FILES=gnutls-api.texi socket-api.texi x509-api.texi pkcs12-api.texi \
        dtls-api.texi crypto-api.texi ocsp-api.texi tpm-api.texi dane-api.texi \
        pkcs7-api.texi
 
-clean-local:
-       -rm -f stamp_enums stamp_functions
-       -rm -rf functions/ enums/
-       -rm -f $(API_FILES)
+MAINTAINERCLEANFILES += stamp_enums stamp_functions functions enums
 
 gnutls_TEXINFOS += $(API_FILES)