Rename them back (using our own make rules anyway).

diff --git a/gedcom/gedcom_1byte.l b/gedcom/gedcom_1byte.lex
similarity index 100%
rename from gedcom/gedcom_1byte.l
rename to gedcom/gedcom_1byte.lex

diff --git a/gedcom/gedcom_hilo.l b/gedcom/gedcom_hilo.lex
similarity index 100%
rename from gedcom/gedcom_hilo.l
rename to gedcom/gedcom_hilo.lex

diff --git a/gedcom/gedcom_lohi.l b/gedcom/gedcom_lohi.lex
similarity index 100%
rename from gedcom/gedcom_lohi.l
rename to gedcom/gedcom_lohi.lex