[CMake] Add explicit Glibc dependencies to account for "autolinking" (#16401)

76ef276 made the compiler autolink libraries more eagerly than before.
This normally wouldn't affect the products we build with CMake, but
when an overlay is autolinked the compiler also puts in a dummy symbol
to make sure it gets linked. So now we have to link to the overlay
directly.

(cherry picked from commit 2b31ba3)

Author: jrose-apple

stdlib/private/StdlibCollectionUnittest/CMakeLists.txt

@@ -20,6 +20,10 @@ add_swift_library(swiftStdlibCollectionUnittest ${SWIFT_STDLIB_LIBRARY_BUILD_TYP
   ../../public/core/WriteBackMutableSlice.swift
 
   SWIFT_MODULE_DEPENDS StdlibUnittest
+  SWIFT_MODULE_DEPENDS_LINUX Glibc
+  SWIFT_MODULE_DEPENDS_FREEBSD Glibc
+  SWIFT_MODULE_DEPENDS_CYGWIN Glibc
+  SWIFT_MODULE_DEPENDS_HAIKU Glibc
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags}
   TARGET_SDKS ALL_POSIX_PLATFORMS
   INSTALL_IN_COMPONENT stdlib-experimental)

stdlib/private/StdlibUnicodeUnittest/CMakeLists.txt

@@ -9,6 +9,10 @@ add_swift_library(swiftStdlibUnicodeUnittest ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES}
   Collation.swift
 
   SWIFT_MODULE_DEPENDS StdlibUnittest
+  SWIFT_MODULE_DEPENDS_LINUX Glibc
+  SWIFT_MODULE_DEPENDS_FREEBSD Glibc
+  SWIFT_MODULE_DEPENDS_CYGWIN Glibc
+  SWIFT_MODULE_DEPENDS_HAIKU Glibc
   SWIFT_COMPILE_FLAGS ${swift_stdlib_unittest_compile_flags}
   TARGET_SDKS ALL_POSIX_PLATFORMS
   INSTALL_IN_COMPONENT stdlib-experimental)