allow build of static libs on windows with MS Visual Studio

Almost: meson uses always ".a" extension  which is a pain. I can't solve that.

meson.build

@@ -109,7 +109,10 @@ win = import('windows')
 subdir('include')
 subdir('src')
 subdir('testbed')
+
+if get_option('utils')
 subdir('utils')
+endif
 
 if get_option('samples')
   subdir('utils/samples')

meson_options.txt

@@ -1,6 +1,7 @@
 option('jpeg', type: 'feature', value: 'auto', description: 'Use JPEG')
 option('tiff', type: 'feature', value: 'auto', description: 'Use LibTiff')
 
+option('utils', type: 'boolean', value: 'false', description: 'Build the utils')
 option('samples', type: 'boolean', value: 'false', description: 'Build the samples')
 option('fastfloat', type: 'boolean', value: 'false', description: 'Build and install the fast float plugin, use only if GPL 3.0 is acceptable')
 option('threaded', type: 'boolean', value: 'false', description: 'Build and install the multi threaded plugin, use only if GPL 3.0 is acceptable')

src/meson.build

@@ -28,14 +28,17 @@ lcms2_srcs = files(
 )
 
 if host_machine.system() == 'windows'
-  lcms2_rc = configure_file(
-    input: 'lcms2.rc.in',
-    configuration: version_cfg,
-    output: 'lcms2.rc',
-  )
+    if get_option('default_library') == 'shared'
 
-  lcms2_srcs += win.compile_resources(lcms2_rc)
-  cargs += '-DCMS_DLL_BUILD=1'
+    lcms2_rc = configure_file(
+        input: 'lcms2.rc.in',
+        configuration: version_cfg,
+        output: 'lcms2.rc',
+        )
+
+        lcms2_srcs += win.compile_resources(lcms2_rc)
+        cargs += '-DCMS_DLL_BUILD=1'
+    endif  
 endif
 
 liblcms2_lib = library(