ltrace: don't crash on duplicate symbols in musl.

srcpkgs/ltrace/template

@@ -1,7 +1,7 @@
 # Template file for 'ltrace'
 pkgname=ltrace
 version=0.7.3.20160924
-revision=1
+revision=2
 _githash=82c66409c7a93ca6ad2e4563ef030dfb7e6df4d4
 wrksrc="${pkgname}-${_githash}"
 build_style=gnu-configure
@@ -24,6 +24,7 @@ pre_configure() {
 		sed -i -e '/error.h/d' -e 's/error(1, errno/err(1/' \
 			read_config_file.c expr.c zero.c
 		sed -i '1i#include <sys/types.h>' proc.h
+		sed -i 's/#ifndef __mips__/#if 0/' proc.c
 	esac
 
 	autoreconf -fi