build: add mapping between ecore_file and ecore-file for pkgconfig files

elua.pc was depending on a ecore_file pc file it is named ecore-file. We have
mapping for similar cases. This one was just forgotten it seems.

Fixes T5075

m4/efl.m4

@@ -180,6 +180,9 @@ case "m4_defn([DOWNOTHER])" in
    ecore_sdl)
       depname="ecore-sdl"
       ;;
+   ecore_file)
+      depname="ecore-file"
+      ;;
 esac
 requirements_pc_[]m4_defn([DOWNEFL])="${depname} >= ${PACKAGE_VERSION} ${requirements_pc_[][]m4_defn([DOWNEFL])}"
 requirements_cflags_[]m4_defn([DOWNEFL])="-I\$(top_srcdir)/src/lib/${libdirname} -I\$(top_builddir)/src/lib/${libdirname} ${requirements_cflags_[][]m4_defn([DOWNEFL])}"