meson: correct Windows/MSVC output name for libvmaf (vmaf.lib)

Author: StormBytePP

libvmaf/src/meson.build

@@ -587,6 +587,7 @@ libvmaf = library(
         libvmaf_cpu_static_lib.extract_all_objects(recursive: true),
         libsvm_static_lib.extract_all_objects(recursive: true),
     ],
+    name_prefix: '',
     version : vmaf_soname_version,
     soversion : vmaf_soversion,
     install: true,
@@ -596,7 +597,7 @@ pkg_mod = import('pkgconfig')
 pkg_mod.generate(libraries: libvmaf,
     version: meson.project_version(),
     name: 'libvmaf',
-    filebase: 'libvmaf',
+    filebase: 'vmaf',
     description: 'VMAF, Video Multimethod Assessment Fusion',
     subdirs: [ '.', 'libvmaf']
 )