aedi: bump oldest supported os version for x64 to 10.15

moltenvk 1.2.8 cannot be built for 10.13 because of glslang dependency on filesystem from c++ standard library

aedi/target/library_tier1.py

@@ -213,8 +213,8 @@ def __init__(self, name='moltenvk'):
 
     def prepare_source(self, state: BuildState):
         state.download_source(
-            'https://github.com/KhronosGroup/MoltenVK/archive/refs/tags/v1.2.7.tar.gz',
-            '3166edcfdca886b4be1a24a3c140f11f9a9e8e49878ea999e3580dfbf9fe4bec')
+            'https://github.com/KhronosGroup/MoltenVK/archive/refs/tags/v1.2.8.tar.gz',
+            '85beaf8abfcc54d9da0ff0257ae311abd9e7aa96e53da37e1c37d6bc04ac83cd')
 
     def initialize(self, state: BuildState):
         super().initialize(state)
@@ -279,7 +279,7 @@ def _make_dylib(self, state: BuildState):
                 '-dynamiclib',
                 '-arch', 'arm64',
                 '-arch', 'x86_64',
-                '-mmacosx-version-min=10.13',
+                '-mmacosx-version-min=10.15',
                 '-compatibility_version', '1.0.0',
                 '-current_version', '1.0.0',
                 '-install_name', '@rpath/libMoltenVK.dylib',
@@ -454,7 +454,7 @@ def detect(self, state: BuildState) -> bool:
 
     def configure(self, state: BuildState):
         hosts = {
-            'x86_64': 'x86_64-darwin17-gcc',
+            'x86_64': 'x86_64-darwin19-gcc',
             'arm64': 'arm64-darwin20-gcc',
         }
 

aedi/utility.py

@@ -25,7 +25,7 @@
 from .packaging.version import Version as StrictVersion
 
 # Minimum OS versions
-OS_VERSION_X86_64 = StrictVersion('10.13')
+OS_VERSION_X86_64 = StrictVersion('10.15')
 OS_VERSION_ARM64 = StrictVersion('11.0')