libzigc/math: Implement lrintf

This was checked by running:

```
$ ./build/stage3/bin/zig build -p stage4 -Denable-llvm -Dno-lib

$ stage4/bin/zig build test-libc -Dlibc-test-path=<LIBC-TEST-PATH> -Dtest-filter=lrintf -fqemu -fwasmtime --summary line
Build Summary: 369/369 steps succeeded
```

lib/c/math.zig

@@ -72,6 +72,7 @@ comptime {
         symbol(&frexp, "frexp");
         symbol(&hypot, "hypot");
         symbol(&lrint, "lrint");
+        symbol(&lrintf, "lrintf");
         symbol(&modf, "modf");
         symbol(&pow, "pow");
         symbol(&pow10, "pow10");
@@ -238,6 +239,10 @@ fn lrint(x: f64) callconv(.c) c_long {
     return @intFromFloat(rint(x));
 }
 
+fn lrintf(x: f32) callconv(.c) c_long {
+    return @intFromFloat(rintf(x));
+}
+
 fn modfGeneric(comptime T: type, x: T, iptr: *T) T {
     if (math.isNegativeInf(x)) {
         iptr.* = -math.inf(T);

lib/libc/musl/src/math/aarch64/lrintf.c

@@ -1,10 +0,0 @@
-#include <math.h>
-
-long lrintf(float x)
-{
-	long n;
-	__asm__ (
-		"frintx %s1, %s1\n"
-		"fcvtzs %x0, %s1\n" : "=r"(n), "+w"(x));
-	return n;
-}

lib/libc/musl/src/math/i386/lrintf.c

@@ -1,8 +0,0 @@
-#include <math.h>
-
-long lrintf(float x)
-{
-	long r;
-	__asm__ ("fistpl %0" : "=m"(r) : "t"(x) : "st");
-	return r;
-}

lib/libc/musl/src/math/lrintf.c

@@ -1,8 +0,0 @@
-#include <math.h>
-
-/* uses LONG_MAX > 2^24, see comments in lrint.c */
-
-long lrintf(float x)
-{
-	return rintf(x);
-}

lib/libc/musl/src/math/powerpc64/lrintf.c

@@ -1,16 +0,0 @@
-#include <math.h>
-
-#ifdef _ARCH_PWR5X
-
-long lrintf(float x)
-{
-	long n;
-	__asm__ ("fctid %0, %1" : "=d"(n) : "f"(x));
-	return n;
-}
-
-#else
-
-#include "../lrintf.c"
-
-#endif

lib/libc/musl/src/math/x32/lrintf.s

@@ -1,5 +0,0 @@
-.global lrintf
-.type lrintf,@function
-lrintf:
-	cvtss2si %xmm0,%rax
-	ret

lib/libc/musl/src/math/x86_64/lrintf.c

@@ -1,8 +0,0 @@
-#include <math.h>
-
-long lrintf(float x)
-{
-	long r;
-	__asm__ ("cvtss2si %1, %0" : "=r"(r) : "x"(x));
-	return r;
-}

src/libs/musl.zig

@@ -787,7 +787,6 @@ const src_files = [_][]const u8{
     "musl/src/math/aarch64/llrintf.c",
     "musl/src/math/aarch64/llround.c",
     "musl/src/math/aarch64/llroundf.c",
-    "musl/src/math/aarch64/lrintf.c",
     "musl/src/math/aarch64/lround.c",
     "musl/src/math/aarch64/lroundf.c",
     "musl/src/math/aarch64/nearbyint.c",
@@ -858,7 +857,6 @@ const src_files = [_][]const u8{
     "musl/src/math/i386/log1p.s",
     "musl/src/math/i386/log2l.s",
     "musl/src/math/i386/logl.s",
-    "musl/src/math/i386/lrintf.c",
     "musl/src/math/i386/lrintl.c",
     "musl/src/math/i386/remainder.c",
     "musl/src/math/i386/remainderf.c",
@@ -906,7 +904,6 @@ const src_files = [_][]const u8{
     "musl/src/math/logbf.c",
     "musl/src/math/logbl.c",
     "musl/src/math/logl.c",
-    "musl/src/math/lrintf.c",
     "musl/src/math/lrintl.c",
     "musl/src/math/lround.c",
     "musl/src/math/lroundf.c",
@@ -935,7 +932,6 @@ const src_files = [_][]const u8{
     "musl/src/math/pow_data.c",
     "musl/src/math/powerpc64/fma.c",
     "musl/src/math/powerpc64/fmaf.c",
-    "musl/src/math/powerpc64/lrintf.c",
     "musl/src/math/powerpc64/lround.c",
     "musl/src/math/powerpc64/lroundf.c",
     "musl/src/math/powerpc/fma.c",
@@ -1007,7 +1003,6 @@ const src_files = [_][]const u8{
     "musl/src/math/x32/log1pl.s",
     "musl/src/math/x32/log2l.s",
     "musl/src/math/x32/logl.s",
-    "musl/src/math/x32/lrintf.s",
     "musl/src/math/x32/lrintl.s",
     "musl/src/math/x32/remainderl.s",
     "musl/src/math/x32/rintl.s",
@@ -1027,7 +1022,6 @@ const src_files = [_][]const u8{
     "musl/src/math/x86_64/log1pl.s",
     "musl/src/math/x86_64/log2l.s",
     "musl/src/math/x86_64/logl.s",
-    "musl/src/math/x86_64/lrintf.c",
     "musl/src/math/x86_64/lrintl.c",
     "musl/src/math/x86_64/remainderl.c",
     "musl/src/math/x86_64/remquol.c",

src/libs/wasi_libc.zig

@@ -732,7 +732,6 @@ const libc_top_half_src_files = [_][]const u8{
     "musl/src/math/logbf.c",
     "musl/src/math/logbl.c",
     "musl/src/math/logl.c",
-    "musl/src/math/lrintf.c",
     "musl/src/math/lrintl.c",
     "musl/src/math/lround.c",
     "musl/src/math/lroundf.c",