re-enable some wasm things in runtime

No idea why the floattidf procs are bodged to return 0, does somebody
know? I have just enabled the original codepath, if nobody knows I
suggest just enabling it and see if we get complaints, it works on all
wasm stuff I tried.

The linkage being set to "internal" instead of "strong" is actually
causing problems in my projects which is what prompted looking at this
in the first place, some of these functions were actually needed but not
added/used because they had internal linkage. This only happens on
bigger projects (or just when using f16?).

Unfortunately `git blame` gave me this generic commit: https://github.com/odin-lang/Odin/commit/94bad4d7861c78b9e7191ec0c3114861a1536d5c#diff-fb9f42022cb95efa59d16813546b8cb310234428c85edfabf09b1425c9dc46af

base/runtime/internal.odin

@@ -8,10 +8,9 @@ IS_WASM :: ODIN_ARCH == .wasm32 || ODIN_ARCH == .wasm64p32
 
 @(private)
 RUNTIME_LINKAGE :: "strong" when (
-	(ODIN_USE_SEPARATE_MODULES || 
+	ODIN_USE_SEPARATE_MODULES || 
 	ODIN_BUILD_MODE == .Dynamic ||
-	!ODIN_NO_CRT) &&
-	!IS_WASM) else "internal"
+	!ODIN_NO_CRT) else "internal"
 RUNTIME_REQUIRE :: false // !ODIN_TILDE
 
 @(private)
@@ -879,9 +878,6 @@ extendhfsf2 :: proc "c" (value: __float16) -> f32 {
 
 @(link_name="__floattidf", linkage=RUNTIME_LINKAGE, require=RUNTIME_REQUIRE)
 floattidf :: proc "c" (a: i128) -> f64 {
-when IS_WASM {
-	return 0
-} else {
 	DBL_MANT_DIG :: 53
 	if a == 0 {
 		return 0.0
@@ -921,14 +917,10 @@ when IS_WASM {
 	fb[0] = u32(a)                           // mantissa-low
 	return transmute(f64)fb
 }
-}
 
 
 @(link_name="__floattidf_unsigned", linkage=RUNTIME_LINKAGE, require=RUNTIME_REQUIRE)
 floattidf_unsigned :: proc "c" (a: u128) -> f64 {
-when IS_WASM {
-	return 0
-} else {
 	DBL_MANT_DIG :: 53
 	if a == 0 {
 		return 0.0
@@ -966,7 +958,6 @@ when IS_WASM {
 	fb[0] = u32(a)                           // mantissa-low
 	return transmute(f64)fb
 }
-}