Fix preservation of LDFLAGS value during configure script

Fixes #738.

ChangeLog

@@ -2,6 +2,8 @@ What's new in version 2.1.1
 
 * Check for pkg-config when building with --enable-delayacct
   (thanks to @florian2833z for the report)
+* BUGFIX: preserve LDFLAGS when building
+  (thanks to Lance Frederickson for the report)
 * BUGFIX: fix issue with small terminals
   (thanks to Daniel Elf for the report)
 * BUGFIX: fix crash with particular keycodes

configure.ac

@@ -167,7 +167,7 @@ m4_define([HTOP_CHECK_SCRIPT],
          LIBS="$htop_config_script $LIBS "
          htop_script_success=yes
       ], [])
-      LDFLAGS="$save_LDFLAGS"
+      LDFLAGS="$htop_save_LDFLAGS"
    fi
    if test "x$htop_script_success" = xno; then
       [$5]