package/proxychains-ng: set -fPIC

Set -fPIC to avoid the following build failure with some architectures
such as mips or aarch64 raised since bump to version 4.14 in commit
35953d1e61aa8581be09c9dca39365955b10590e and
https://github.com/rofl0r/proxychains-ng/commit/35a674bdbc294730429a1007c9e7ce01e65b49b5:

checking what's the option to use in linker to set library name ...
cannot find an option to set library name

Fixes:
 - http://autobuild.buildroot.org/results/8ed1481e29321ed3da40251f700cb3bd66f62c94
 - http://autobuild.buildroot.org/results/fd01df6eb9a37257894740d44a33eece9123355a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 441b859a1e3a5b2a6bbbc8990f67c33913aa2385)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/proxychains-ng/proxychains-ng.mk

@@ -13,7 +13,8 @@ PROXYCHAINS_NG_CPE_ID_VENDOR = proxychains-ng_project
 
 define PROXYCHAINS_NG_CONFIGURE_CMDS
 	cd $(@D) && \
-	$(TARGET_CONFIGURE_OPTS) ./configure --prefix=/usr --sysconfdir=/etc
+	$(TARGET_CONFIGURE_OPTS) CPPFLAGS="$(TARGET_CPPFLAGS) -fPIC" \
+		./configure --prefix=/usr --sysconfdir=/etc
 endef
 
 define PROXYCHAINS_NG_BUILD_CMDS