[Buildroot] [git commit branch/next] package/pifmrds: always link with -lm

commit: https://git.buildroot.net/buildroot/commit/?id=8258081602cf0cacf182fccafdf2f437b1c3f5c5
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/next

Commit 888546e5273d77d49bec564a515e85d7acee6bdd wrongly removed linking
with -lm resulting in the following build failure:

/home/buildroot/autobuild/run/instance-3/output-1/host/bin/arm-linux-gnueabihf-gcc  -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o -L/home/buildroot/autobuild/run/instance-3/output-1/host/bin/../arm-buildroot-linux-gnueabihf/sysroot/usr/lib -lsndfile
/home/buildroot/autobuild/run/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: fm_mpx.o: undefined reference to symbol 'cos@@GLIBC_2.4'
/home/buildroot/autobuild/run/instance-3/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libm.so.6: error adding symbols: DSO missing from command line

Fixes:
 - http://autobuild.buildroot.org/results/b2a6e6fd77bf9071ce9f75fed1811be9ffe5366d

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <redacted>
---
 package/pifmrds/0003-Makefile-fix-static-link.patch | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/pifmrds/0003-Makefile-fix-static-link.patch b/package/pifmrds/0003-Makefile-fix-static-link.patch
index 3bd91c981f..3832b77d59 100644
--- a/package/pifmrds/0003-Makefile-fix-static-link.patch
+++ b/package/pifmrds/0003-Makefile-fix-static-link.patch

@@ -15,11 +15,11 @@ diff -purN pifmrds-0bf57f9ce0d954365a38d8af8e7be6f28521c3f2.orig/src/Makefile pi
  
  app: rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o
 -	$(CC) $(LDFLAGS) -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o -lm -lsndfile
-+	$(CC) $(LDFLAGS) -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o $(SNDFILE_LIBS)
++	$(CC) $(LDFLAGS) -o pi_fm_rds rds.o waveforms.o pi_fm_rds.o fm_mpx.o control_pipe.o $(SNDFILE_LIBS) -lm
  
  rds_wav: rds.o waveforms.o rds_wav.o fm_mpx.o
 -	$(CC) $(LDFLAGS) -o rds_wav rds_wav.o rds.o waveforms.o fm_mpx.o -lm -lsndfile
-+	$(CC) $(LDFLAGS) -o rds_wav rds_wav.o rds.o waveforms.o fm_mpx.o $(SNDFILE_LIBS)
++	$(CC) $(LDFLAGS) -o rds_wav rds_wav.o rds.o waveforms.o fm_mpx.o $(SNDFILE_LIBS) -lm
  
  rds.o: rds.c waveforms.h
  	$(CC) $(CFLAGS) rds.c

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