[libxslt] Link libraries with libm

[Jussi Kukkonen <jussik src gnome org>]

commit df5330d1054bdacf17f4fbd43b528fcf453cc9ec
Author: Jussi Kukkonen <jussi kukkonen intel com>
Date:   Fri Feb 10 14:26:59 2017 +0200

    Link libraries with libm
    
    Otherwise linking the resulting libraries to a binary (e.g. xsltproc)
    fails when using gold linker:
    | ../libxslt/.libs/libxslt.so: error: undefined reference to 'fmod'
    | ../libxslt/.libs/libxslt.so: error: undefined reference to 'pow'
    | ../libexslt/.libs/libexslt.so: error: undefined reference to 'floor'
    | collect2: error: ld returned 1 exit status

 libexslt/Makefile.am |    2 +-
 libxslt/Makefile.am  |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libexslt/Makefile.am b/libexslt/Makefile.am
index 1cf5138..5449524 100644
--- a/libexslt/Makefile.am
+++ b/libexslt/Makefile.am
@@ -27,7 +27,7 @@ libexslt_la_SOURCES =                   \
        libexslt.h                      \
        dynamic.c
 
-libexslt_la_LIBADD = $(top_builddir)/libxslt/libxslt.la $(EXTRA_LIBS) $(LIBGCRYPT_LIBS)
+libexslt_la_LIBADD = $(top_builddir)/libxslt/libxslt.la $(EXTRA_LIBS) $(LIBGCRYPT_LIBS) $(M_LIBS)
 libexslt_la_LDFLAGS = $(WIN32_EXTRA_LDFLAGS) -version-info $(LIBEXSLT_VERSION_INFO)
 
 man_MANS = libexslt.3
diff --git a/libxslt/Makefile.am b/libxslt/Makefile.am
index d9fed68..ef2de24 100644
--- a/libxslt/Makefile.am
+++ b/libxslt/Makefile.am
@@ -62,7 +62,7 @@ else
 LIBXSLT_VERSION_SCRIPT =
 endif
 
-libxslt_la_LIBADD = $(LIBXML_LIBS) $(EXTRA_LIBS)
+libxslt_la_LIBADD = $(LIBXML_LIBS) $(EXTRA_LIBS) $(M_LIBS)
 libxslt_la_LDFLAGS =                                   \
                $(WIN32_EXTRA_LDFLAGS)                  \
                $(LIBXSLT_VERSION_SCRIPT)               \