pkg-versions: Create package version files earlier

Create each openpower package's version files in a PRE_CONFIGURE_HOOK
rather than a PRE_BUILD_HOOK so that packages that determine the version
string to use at configure time can make use of it.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/package/pkg-versions.mk b/openpower/package/pkg-versions.mk
index 474d455..5ad1323 100644
--- a/openpower/package/pkg-versions.mk
+++ b/openpower/package/pkg-versions.mk
@@ -114,7 +114,7 @@
 
 # Add appropriate templates to hooks
 $(2)_POST_PATCH_HOOKS += $(2)_OPENPOWER_PATCH_FILE
-$(2)_PRE_BUILD_HOOKS += $(2)_OPENPOWER_VERSION_FILE
+$(2)_PRE_CONFIGURE_HOOKS += $(2)_OPENPOWER_VERSION_FILE
 
 # Top-level rule to print or generate a subpackage version
 $(1)-version: $$(if $$(wildcard $$($(2)_VERSION_FILE)),$(1)-print-version,$(1)-build-version)