libfdt: fix duplicate meson target

If default_library is set to static, the libfdt target (which just
uses library()) is already static, so we should just use that.

This fixes this Meson error:

	libfdt/meson.build:37:11: ERROR: Tried to create target "fdt", but a target of that name already exists.

Signed-off-by: Alyssa Ross <hi@alyssa.is>
Message-ID: <20240123130742.185409-1-hi@alyssa.is>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

libfdt/meson.build

@@ -34,19 +34,21 @@ libfdt = library(
   install: true,
 )
 
-libfdt_a = static_library(
-  'fdt', sources,
-  install: true,
-)
+link_with = libfdt
+
+if get_option('default_library') != 'static'
+  libfdt_a = static_library(
+    'fdt', sources,
+    install: true,
+  )
+
+  if static_build
+    link_with = libfdt_a
+  endif
+endif
 
 libfdt_inc = include_directories('.')
 
-if static_build
-  link_with = libfdt_a
-else
-  link_with = libfdt
-endif
-
 libfdt_dep = declare_dependency(
   include_directories: libfdt_inc,
   link_with: link_with,