[PATCH] not check libperl under cross compiling

Upstream-Status: Inappropriate [configuration]

libperl ldflags returned by PGAC_CHECK_PERL_EMBED_LDFLAGS are native,
can not be used to check target library.

postpresql has the dependency on perl, so not need to check libperl
again, like in postgresql-9.2.4 

Signed-off-by: Roy Li <rongqing.li@windriver.com>
---
 configure.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: postgresql-9.4.20/configure.in
===================================================================
--- postgresql-9.4.20.orig/configure.in
+++ postgresql-9.4.20/configure.in
@@ -1931,7 +1931,7 @@ if test "$with_tcl" = yes; then
 fi
 
 # check for <perl.h>
-if test "$with_perl" = yes; then
+if test "$with_perl" = yes && test "$cross_compiling" = no; then
   ac_save_CPPFLAGS=$CPPFLAGS
   CPPFLAGS="$CPPFLAGS $perl_includespec"
   AC_CHECK_HEADER(perl.h, [], [AC_MSG_ERROR([header file <perl.h> is required for Perl])],