perl: handle provides in the same way than replaces.

srcpkgs/perl/template

@@ -22,7 +22,7 @@ long_desc="
 
 # Before updating this package to a new major version, run ${FILESDIR}/provides.pl
 # against ${wrksrc} to find the list of built in packages.
-provides="
+_provides="
 perl-Archive-Extract-0.58_1
 perl-Archive-Tar-1.82_1
 perl-Attribute-Handlers-0.93_1
@@ -144,8 +144,9 @@ perl-threads-shared-1.40_1
 perl-version-0.99_1
 "
 
-for _f in ${provides}; do
+for _f in ${_provides}; do
 	_p=$($XBPS_PKGDB_CMD getpkgname ${_f})
+	provides="${provides} ${_f}"
 	replaces="${replaces} ${_p}>=0"
 done