[source] iperf: drop PKG_BUILD_DIR override

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/b0dcb6bfed97cf8e63ad03ca76b49cad45dbffea

commit b0dcb6bfed97cf8e63ad03ca76b49cad45dbffea
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Aug 29 15:09:03 2016 +0200

    iperf: drop PKG_BUILD_DIR override
    
    No longer necessary since the removal of build variants
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/network/utils/iperf/Makefile | 1 -
 1 file changed, 1 deletion(-)

diff --git a/package/network/utils/iperf/Makefile b/package/network/utils/iperf/Makefile
index 11970d1..2bd1917 100644
--- a/package/network/utils/iperf/Makefile
+++ b/package/network/utils/iperf/Makefile
@@ -11,7 +11,6 @@ PKG_NAME:=iperf
 PKG_VERSION:=2.0.9
 PKG_RELEASE:=1
 
-PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@SF/iperf2
 PKG_MD5SUM:=1bb3a1d98b1973aee6e8f171933c0f61