Fix Clang support

The amalgamated release is now confirmed to be working with Clang,
including its integrated assembler.

Fixes #41

test/libc/nexgen32e/crc32_test.c

@@ -37,7 +37,7 @@ TEST(crc32, testBigText) {
     EXPECT_EQ(0xc7adc04f, crc32(0, hyperion, size));
     EXPECT_EQ(0xc7adc04f, crc32_z(0, hyperion, size));
     EXPECT_EQ(0xc7adc04f,
-              0xffffffffu ^ crc32$pclmul(0 ^ 0xffffffffu, hyperion, size));
+              0xffffffffu ^ crc32_pclmul(0 ^ 0xffffffffu, hyperion, size));
   }
 }