gnulib-local: Pull more functions for libxml

* gettext-tools/gnulib-lib/.gitignore: Ignore files brought by
gnulib-tool.
* gettext-tools/gnulib-tests/.gitignore: Likewise.
* gnulib-local/modules/libxml (Depends-on): Add 'pow', 'log10', and
'fabs'.

gettext-tools/gnulib-lib/.gitignore

@@ -185,6 +185,7 @@
 /locale.in.h
 /localename.c
 /localename.h
+/log10.c
 /lstat.c
 /malloc.c
 /malloca.c

gettext-tools/gnulib-tests/.gitignore

@@ -30,6 +30,7 @@
 /minus-zero.h
 /nan.h
 /putenv.c
+/randomd.c
 /read-file.c
 /read-file.h
 /same-inode.h
@@ -76,6 +77,8 @@
 /test-dup2.c
 /test-environ.c
 /test-errno.c
+/test-fabs.c
+/test-fabs.h
 /test-fcntl-h.c
 /test-fcntl.c
 /test-fdopen.c
@@ -135,6 +138,8 @@
 /test-locale.c
 /test-localename.c
 /test-lock.c
+/test-log10.c
+/test-log10.h
 /test-lseek.c
 /test-lseek.sh
 /test-lstat.c
@@ -194,6 +199,7 @@
 /test-posix_spawn_file_actions_addclose.c
 /test-posix_spawn_file_actions_adddup2.c
 /test-posix_spawn_file_actions_addopen.c
+/test-pow.c
 /test-quotearg-simple.c
 /test-quotearg.h
 /test-raise.c

gnulib-local/modules/libxml

@@ -113,6 +113,9 @@ no-c++
 isinf
 isnan
 signbit
+pow
+log10
+fabs
 
 configure.ac:
 gl_LIBXML