perl: fix default libpath

Makes it easier to install cpan modules

packages/perl/build.sh

@@ -3,7 +3,7 @@ TERMUX_PKG_DESCRIPTION="Capable, feature-rich programming language"
 TERMUX_PKG_LICENSE="Artistic-License-2.0"
 TERMUX_PKG_VERSION=(5.28.2
                     1.2.3)
-TERMUX_PKG_REVISION=1
+TERMUX_PKG_REVISION=2
 TERMUX_PKG_SHA256=(aa95456dddb3eb1cc5475fed4e08f91876bea71fb636fba6399054dfbabed6c7
                    84583a1bb5f3a2c64d13d031386c114382e5c62955c6f84a27cec8318536627c)
 TERMUX_PKG_SRCURL=(http://www.cpan.org/src/5.0/perl-${TERMUX_PKG_VERSION}.tar.gz

packages/perl/cnf-configure_path.sh.patch

@@ -0,0 +1,11 @@
+--- ../configure_path.sh.orig	2019-05-17 19:33:29.839841883 +0200
++++ ./cnf/configure_path.sh	2019-05-17 19:33:56.726506709 +0200
+@@ -108,7 +108,7 @@
+ define privlibexp "$privlib"
+ define binexp "$bin"
+ 
+-define libpth "/lib /usr/lib /usr/local/lib"
++define libpth "@TERMUX_PREFIX@/lib @TERMUX_PREFIX@/local/lib"
+ define glibpth "$libpth"
+ define plibpth
+