Add -lc to LIBS/OS_LIBS for Linux.

Bug #72766 r=bryner

configure.in

@@ -725,14 +725,15 @@ case "$target" in
     AC_DEFINE(_POSIX_SOURCE)
     AC_DEFINE(_SVID_SOURCE)
     TARGET_NSPR_MDCPUCFG='\"md/_linux.cfg\"'
+    LIBS="$LIBS -lc"
 
     case "${host_cpu}" in
     alpha*)
-	CFLAGS="$CFLAGS -mieee"
-	CXXFLAGS="$CXXFLAGS -mieee"
+    	CFLAGS="$CFLAGS -mieee"
+    	CXXFLAGS="$CXXFLAGS -mieee"
     ;;
     i?86)
-	USE_ELF_DYNSTR_GC=1
+    	USE_ELF_DYNSTR_GC=1
     ;;
     esac
     ;;