Cherry-pick 9809c1a. rdar://problem/113360320

    SHA1.h doesn't parse after recent SDK changes
    https://bugs.webkit.org/show_bug.cgi?id=259800
    rdar://113360320

    Reviewed by Megan Gardner and Wenson Hsieh.

    * Source/WTF/wtf/SHA1.h:
    Recent SDK changes resulted in CoreUtils headers getting imported into
    translation units (MediaPlayerPrivateWebM.mm) that also import `SHA1.h`.

    The aforementioned CoreUtils headers have long had a macro SHA1(),
    which conflict with our template functions' definitions, and make SHA1.h
    fail to parse.

    As a quick workaround, undefine the rogue macros before our SHA1 class.

    Canonical link: https://commits.webkit.org/266559@main

Canonical link: https://commits.webkit.org/265870.291@safari-7616.1.27.12-branch

Source/WTF/wtf/SHA1.h

@@ -38,6 +38,11 @@
 #include <CommonCrypto/CommonDigest.h>
 #endif
 
+// On Cocoa platforms, CoreUtils.h has a SHA1() macro that sometimes get included above here.
+#ifdef SHA1
+#undef SHA1
+#endif
+
 namespace WTF {
 
 class SHA1 {