remove handling of the case where we don't have alignof in older gdbs

pwndbg/heap/ptmalloc.py

@@ -968,14 +968,7 @@ class GlibcMemoryAllocator(pwndbg.heap.heap.MemoryAllocator):
             # See https://elixir.bootlin.com/glibc/glibc-2.26/source/sysdeps/i386/malloc-alignment.h#L22
             return 16
         # See https://elixir.bootlin.com/glibc/glibc-2.37/source/sysdeps/generic/malloc-alignment.h#L27
-        if hasattr(gdb.Type, "alignof"):
-            long_double_alignment = pwndbg.gdblib.typeinfo.lookup_types("long double").alignof
-        else:
-            # alignof doesn't available in GDB < 8.2 (https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=gdb/NEWS;hb=gdb-8.2-release)
-            # Hardcoded return correct MALLOC_ALIGNMENT for powerpc
-            # TODO: This will be wrong if there's another architecture similar to powerpc
-            # TODO: We can remove this when we drop supports for GDB < 8.2
-            return 16 if pwndbg.gdblib.arch.current == "powerpc" else 2 * self.size_sz
+        long_double_alignment = pwndbg.gdblib.typeinfo.lookup_types("long double").alignof
         return (
             long_double_alignment if 2 * self.size_sz < long_double_alignment else 2 * self.size_sz
         )