[devhelp] build: link to LIBM only in the app

[Sébastien Wilmet <swilmet src gnome org>]

commit aa9cdbade99d2e25b6cf8dce64cac1aeec03dc68
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Feb 22 14:36:13 2018 +0100

    build: link to LIBM only in the app
    
    The library and unit tests don't need extra math functions, only the app
    in src/.

 devhelp/Makefile.am    |    3 +--
 unit-tests/Makefile.am |    3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/devhelp/Makefile.am b/devhelp/Makefile.am
index 1da59db..1ff66c4 100644
--- a/devhelp/Makefile.am
+++ b/devhelp/Makefile.am
@@ -104,8 +104,7 @@ libdevhelp_3_la_SOURCES =
 
 libdevhelp_3_la_LIBADD =       \
        libdevhelp-core.la      \
-       $(DEVHELP_LIBS)         \
-       $(LIBM)
+       $(DEVHELP_LIBS)
 
 libdevhelp_3_la_LDFLAGS =                      \
        $(AM_LDFLAGS)                           \
diff --git a/unit-tests/Makefile.am b/unit-tests/Makefile.am
index 0ed1c20..cadb8a5 100644
--- a/unit-tests/Makefile.am
+++ b/unit-tests/Makefile.am
@@ -7,8 +7,7 @@ AM_CPPFLAGS =                           \
 AM_LDFLAGS = $(WARN_LDFLAGS)
 
 LDADD = $(top_builddir)/devhelp/libdevhelp-core.la     \
-       $(DEVHELP_LIBS)                                 \
-       $(LIBM)
+       $(DEVHELP_LIBS)
 
 UNIT_TEST_PROGS =