[source] busybox: Move libresolv detection to LEDE Makefile

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/449880e0ffe528999c17f6ad6e4f87f1f4c46cdd

commit 449880e0ffe528999c17f6ad6e4f87f1f4c46cdd
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Wed Apr 12 09:02:30 2017 -0700

    busybox: Move libresolv detection to LEDE Makefile
    
    Since the LEDE nslookup applet is already specific to LEDE, move the
    libresolv detection into the busybox Makefile that LEDE uses.
    
    This fixes builds with external toolchains that don't automatically
    search for headers and/or libraries without being told so.
    
    Fixes: de5b8e5d2fe1 ("busybox: add musl compatible nslookup replacement")
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 package/utils/busybox/Makefile                         |  6 ++++++
 .../utils/busybox/patches/230-add_nslookup_lede.patch  | 18 ------------------
 2 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
index c1e60ea..fdac78f 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -85,6 +85,12 @@ ifdef CONFIG_BUSYBOX_CONFIG_PAM
   LDLIBS += pam pam_misc pthread
 endif
 
+ifdef CONFIG_BUSYBOX_DEFAULT_NSLOOKUP_LEDE
+  ifeq ($(CONFIG_USE_GLIBC),y)
+	LDLIBS += resolv
+  endif
+endif
+
 define Build/Compile
 	+$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) \
 		CC="$(TARGET_CC)" \
diff --git a/package/utils/busybox/patches/230-add_nslookup_lede.patch b/package/utils/busybox/patches/230-add_nslookup_lede.patch
index bff88a6..9e89837 100644
--- a/package/utils/busybox/patches/230-add_nslookup_lede.patch
+++ b/package/utils/busybox/patches/230-add_nslookup_lede.patch
@@ -12,28 +12,10 @@ and the libresolv primitives to parse received DNS responses.
 
 Signed-off-by: Jo-Philipp Wich <jo at mein.io>
 ---
- Makefile.flags             |   6 +
  networking/nslookup_lede.c | 869 +++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 875 insertions(+)
  create mode 100644 networking/nslookup_lede.c
 
-diff --git a/Makefile.flags b/Makefile.flags
-index 65021de..096ab77 100644
---- a/Makefile.flags
-+++ b/Makefile.flags
-@@ -134,6 +134,12 @@ else
- LDLIBS += m
- endif
- 
-+# nslookup_lede might need the resolv library
-+RESOLV_AVAILABLE := $(shell echo 'int main(void){res_init();return 0;}' >resolvtest.c; $(CC) $(CFLAGS) -include resolv.h -lresolv -o /dev/null resolvtest.c >/dev/null 2>&1 && echo "y"; rm resolvtest.c)
-+ifeq ($(RESOLV_AVAILABLE),y)
-+LDLIBS += resolv
-+endif
-+
- # libpam may use libpthread, libdl and/or libaudit.
- # On some platforms that requires an explicit -lpthread, -ldl, -laudit.
- # However, on *other platforms* it fails when some of those flags
 diff --git a/networking/nslookup_lede.c b/networking/nslookup_lede.c
 new file mode 100644
 index 0000000..fe927ad