fix: freetype c_standard gnu11 for macOS POSIX; libpng disable ARM NEON on Apple Silicon

Author: FarnaHerry

pkgs/c/compat.freetype.lua

@@ -40,7 +40,7 @@ package = {
     mcpp = {
         language     = "c++23",
         import_std   = false,
-        c_standard   = "c99",
+        c_standard   = "gnu11",
         include_dirs = { "*/include" },
         sources = {
             -- Base (aggregate + required extra files)

pkgs/c/compat.libpng.lua

@@ -280,6 +280,6 @@ package = {
         },
         targets = { ["libpng"] = { kind = "lib" } },
         deps    = { ["compat.zlib"] = "1.3.2" },
-        cflags  = { "-DPNG_HARDWARE_OPTIMIZATIONS=0" },
+        cflags  = { "-DPNG_HARDWARE_OPTIMIZATIONS=0", "-DPNG_ARM_NEON_OPT=0" },
     },
 }