Make C memory safe like Rust

This change enables Address Sanitizer systemically w/ `make MODE=dbg`.
Our version of Rust's `unsafe` keyword is named `noasan` which is used
for two functions that do aligned memory chunking, like `strcpy.c` and
we need to fix the tiny DEFLATE code, but that's it everything else is
fabulous you can have all the fischer price security blankets you need

Best of all is we're now able to use the ASAN data in Blinkenlights to
colorize the memory dumps. See the screenshot below of a test program:

  https://justine.lol/blinkenlights/asan.png

Which is operating on float arrays stored on the stack, with red areas
indicating poisoned memory, and the green areas indicate valid memory.

libc/nexgen32e/kcp437.S

@@ -90,6 +90,6 @@ kCp437:
 .short	0x03b1,0x00df,0x0393,0x03c0,0x03a3,0x03c3,0x03bc,0x03c4	#e0:αßΓπΣσμτ
 .short	0x03a6,0x0398,0x03a9,0x03b4,0x221e,0x03c6,0x03b5,0x2229	#e8:ΦΘΩδ∞φε∩
 .short	0x2261,0x00b1,0x2265,0x2264,0x2320,0x2321,0x00f7,0x2248	#f0:≡±≥≤⌠⌡÷≈
-.short	0x00b0,0x2219,0x00b7,0x221a,0x207f,0x00b2,0x25a0,0x03bb	#f8:°∙·√ⁿ²■λ
+.short	0x00b0,0x2219,0x00d7,0x221a,0x207f,0x00b2,0x25a0,0x03bb	#f8:°∙×√ⁿ²■λ
 .endobj	kCp437,globl
 .previous