perl: put -rdynamic in proper build variable

The standard way to pass -rdynamic (or -Wl,--dynamic-export) is via
the $ccdlflags variable.  Do what is best practice.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

lang/perl/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=perl
 PKG_VERSION:=5.24.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=\
 		https://cpan.metacpan.org/src/5.0 \
@@ -96,7 +96,7 @@ define Build/Configure
 	                                -Dowrt:gccversion=$(CONFIG_GCC_VERSION) \
 	                                -Dowrt:target_cross='$(TARGET_CROSS)' \
 	                                -Dowrt:cflags='$(TARGET_CFLAGS_PERL) $(TARGET_CPPFLAGS_PERL)' \
-	                                -Dowrt:ldflags='-rdynamic $(TARGET_LDFLAGS)' \
+	                                -Dowrt:ldflags='$(TARGET_LDFLAGS)' \
 	                                -Dowrt:libc=$(subst uClibc,uclibc,$(CONFIG_LIBC)) \
 	                                -Dowrt:ipv6=$(if $($(CONFIG_IPV6)),define,undef) \
 	                                -Dowrt:threads=$(if $(CONFIG_PERL_THREADS),yes,no) \

lang/perl/files/base.config

@@ -1006,7 +1006,7 @@ full_ar="${owrt:target_cross}ar"
 cppflags="$owrt:cflags"
 ccflags="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 $owrt:cflags"
 ccflags_uselargefiles='-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
-ccdlflags="-fPIC -Wl,-rpath,$owrt:perllibpath/CORE"
+ccdlflags="-fPIC -rdynamic -Wl,-rpath,$owrt:perllibpath/CORE"
 cccdlflags='-fPIC'
 ldflags="$owrt:ldflags"
 ldflags_uselargefiles=''