perl: dont pass linker flags to `clang -E`

I.e. preprocessor mode. This silences warning messages both when
cross-compiling perl and when compiling perl packages on device.

Note that the main perl binary ends up with RUNPATH set to
$PREFIX/lib/perl5/5.32.1/arm-android/CORE, instead of $PREFIX/lib
_and_ $PREFIX/lib/perl5/5.32.1/arm-android/CORE.  perl only links
against the standard libraries and libperl.so though, and the latter
is in $PREFIX/lib/perl5/5.32.1/arm-android/CORE so there should be no
need to add $PREFIX/lib to RUNPATH (unless I am missing something).

Tested by running perl and installing some perl modules on an arm
tablet,

packages/perl/build.sh

@@ -8,6 +8,7 @@ TERMUX_PKG_MAINTAINER="@termux"
 # - psutils
 TERMUX_PKG_VERSION=(5.32.1
                     1.3.5)
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SHA256=(03b693901cd8ae807231b1787798cf1f2e0b8a56218d07b7da44f784a7caeb2c
                    91c66f6b2b99fccfd4fee14660b677380b0c98f9456359e91449798c2ad2ef25)
 TERMUX_PKG_SRCURL=(http://www.cpan.org/src/5.0/perl-${TERMUX_PKG_VERSION}.tar.gz
@@ -60,7 +61,8 @@ termux_step_configure() {
 		-Dsysroot=$TERMUX_STANDALONE_TOOLCHAIN/sysroot \
 		-Dprefix=$TERMUX_PREFIX \
 		-Dsh=$TERMUX_PREFIX/bin/sh \
-		-Dcc="$ORIG_CC -Wl,-rpath=$TERMUX_PREFIX/lib -Wl,--enable-new-dtags" \
+		-Dcc="$ORIG_CC" \
+		-Dld="$ORIG_CC -Wl,-rpath=$TERMUX_PREFIX/lib -Wl,--enable-new-dtags" \
 		-Duseshrplib
 }