Fix a compilation with non-clang/non-gcc compilers

patches/mutex.patch

Index: patches/mutex.patch
diff --git a/patches/mutex.patch b/patches/mutex.patch
index b4b5e2206e4961ec1b635627ab4432aec4002de8..fe3259fee947fef02a2c2b1c400523563a3c7fcb 100644
--- a/patches/mutex.patch
+++ b/patches/mutex.patch
@@ -1,5 +1,5 @@
 diff --git a/source/common/putilimp.h b/source/common/putilimp.h
-index e3da340..430e697 100644
+index e3da340..90bae92 100644
 --- a/source/common/putilimp.h
 +++ b/source/common/putilimp.h
 @@ -1,7 +1,7 @@
@@ -11,7 +11,7 @@ index e3da340..430e697 100644
  *   Corporation and others.  All Rights Reserved.
  *
  ******************************************************************************
-@@ -229,6 +229,23 @@ typedef size_t uintptr_t;
+@@ -229,6 +229,26 @@ typedef size_t uintptr_t;
  #endif
  
  
@@ -22,15 +22,18 @@ index e3da340..430e697 100644
 + */
 +#ifdef U_HAVE_CLANG_ATOMICS
 +    /* Use the predefined value. */
-+#elif defined(__clang__) && \
-+      __has_builtin(__c11_atomic_load) && \
-+      __has_builtin(__c11_atomic_store) && \
-+      __has_builtin(__c11_atomic_fetch_add) && \
-+      __has_builtin(__c11_atomic_fetch_sub)
++#elif !defined(__clang__)
++#    define U_HAVE_CLANG_ATOMICS 0
++#else
++#if __has_builtin(__c11_atomic_load) && \
++    __has_builtin(__c11_atomic_store) && \
++    __has_builtin(__c11_atomic_fetch_add) && \
++    __has_builtin(__c11_atomic_fetch_sub)
 +#    define U_HAVE_CLANG_ATOMICS 1
 +#else
 +#    define U_HAVE_CLANG_ATOMICS 0
 +#endif
++#endif
 +
  /*===========================================================================*/
  /** @{ Code alignment                                                        */