[Buildroot] [git commit] package/ocrad: fix static build

[Yann E. MORIN]

commit: https://git.buildroot.net/buildroot/commit/?id=01325361970e39f40b68dd1a2a3ecd988be044ae
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fix the following static build failure raised since bump to version 0.28
in commit 1b677db703dc0b976a707942bbc94ecd3f7b4b4b:

/home/buildroot/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/9.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: /home/buildroot/autobuild/run/instance-2/output-1/host/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libpng.a(png.o): in function `png_reset_crc':
png.c:(.text+0x738): undefined reference to `crc32'

Note that the custom, hand-rolled configure script inserts the LIBS we
pass on the command line, in front of the hard-coded LIBS, which
currently is just LIBS=-lpng, so we end up with a final LIBS set to:
    LIBS=-L.../sysroot/usr/lib -lpng16 -lz -lpng

... the latter -lpng being redundant and unnecessary, but innocuous.

Fixes:
 - http://autobuild.buildroot.org/results/97543d8df5c40818e05622490e4aad60b48934a6

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
[yann.morin.1998 at free.fr: split multi-line one item per line]
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
---
 package/ocrad/ocrad.mk | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/package/ocrad/ocrad.mk b/package/ocrad/ocrad.mk
index 78638b770a..d62b7af351 100644
--- a/package/ocrad/ocrad.mk
+++ b/package/ocrad/ocrad.mk
@@ -10,12 +10,19 @@ OCRAD_SITE = $(BR2_GNU_MIRROR)/ocrad
 OCRAD_LICENSE = GPL-2.0+
 OCRAD_LICENSE_FILES = COPYING
 OCRAD_INSTALL_STAGING = YES
-OCRAD_DEPENDENCIES = libpng
+OCRAD_DEPENDENCIES = host-pkgconf libpng
+
+OCRAD_LIBS = `$(PKG_CONFIG_HOST_BINARY) --libs libpng`
 
 # This is not a true autotools package.
 define OCRAD_CONFIGURE_CMDS
 	cd $(@D) && \
-	$(TARGET_MAKE_ENV) ./configure --prefix=/usr --sysconfdir=/etc $(TARGET_CONFIGURE_OPTS)
+	$(TARGET_MAKE_ENV) \
+	./configure \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		$(TARGET_CONFIGURE_OPTS) \
+		LIBS="$(OCRAD_LIBS)"
 endef
 
 define OCRAD_BUILD_CMDS