[Buildroot] [PATCH 1/1] package/gd: fix addition of -liconv in gdlib.pc.in

[Fabrice Fontaine]

Static build of gnuplot with gd and libiconv is broken since bump to
version 2.3.1 in commit 970b2ca3cc3f927f679c871eeadb22ec110b0ed5:

/home/giuliobenetti/autobuild/run/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/powerpc-buildroot-linux-uclibc/9.3.0/../../../../powerpc-buildroot-linux-uclibc/bin/ld: /home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/../powerpc-buildroot-linux-uclibc/sysroot/usr/lib/libgd.a(gdkanji.o): in function `do_convert':
gdkanji.c:(.text+0x148): undefined reference to `libiconv_open'
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/powerpc-buildroot-linux-uclibc/9.3.0/../../../../powerpc-buildroot-linux-uclibc/bin/ld: gdkanji.c:(.text+0x1d0): undefined reference to `libiconv'

This build failure is raised because LIBS has been replaced by
LIBS_PRIVATES in gdlib.pc.in since
https://github.com/libgd/libgd/commit/28ecfe77c817aff8ce56422d3e4e8533a281bc76

Fixes:
 - http://autobuild.buildroot.org/results/5ab5f4744adfd8d8be483204a9c7f59e34ce26c6

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
---
 package/gd/gd.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/gd/gd.mk b/package/gd/gd.mk
index 97a1a143ec..2df81e6d37 100644
--- a/package/gd/gd.mk
+++ b/package/gd/gd.mk
@@ -36,7 +36,7 @@ endif
 ifeq ($(BR2_PACKAGE_LIBICONV),y)
 GD_DEPENDENCIES += libiconv
 # not strictly needed for gd, but ensures -liconv ends up in gdlib.pc
-GD_CONF_ENV += LIBS="-liconv"
+GD_CONF_ENV += LIBS_PRIVATES="-liconv"
 endif
 
 ifeq ($(BR2_PACKAGE_JPEG),y)
-- 
2.30.2