The changes in 0001-drd-Port-to-Fedora-33.patch break builds on musl. These
need a __GLIBC__ guard to ensure musl builds continue to work.

Upstream-Status: Pending
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Index: valgrind-3.16.1/drd/drd_pthread_intercepts.c
===================================================================
--- valgrind-3.16.1.orig/drd/drd_pthread_intercepts.c
+++ valgrind-3.16.1/drd/drd_pthread_intercepts.c
@@ -180,6 +180,7 @@ static int never_true;
  * functions in both libc and libpthread. Older glibc versions only have an
  * implementation of the pthread functions in libpthread.
  */
+#ifdef __GLIBC__
 #define PTH_FUNC(ret_ty, zf, implf, argl_decl, argl)                    \
    ret_ty VG_WRAP_FUNCTION_ZZ(VG_Z_LIBC_SONAME,zf) argl_decl;           \
    ret_ty VG_WRAP_FUNCTION_ZZ(VG_Z_LIBC_SONAME,zf) argl_decl            \
@@ -187,6 +188,12 @@ static int never_true;
    ret_ty VG_WRAP_FUNCTION_ZZ(VG_Z_LIBPTHREAD_SONAME,zf) argl_decl;     \
    ret_ty VG_WRAP_FUNCTION_ZZ(VG_Z_LIBPTHREAD_SONAME,zf) argl_decl      \
    { return implf argl; }
+#else
+#define PTH_FUNC(ret_ty, zf, implf, argl_decl, argl)                    \
+   ret_ty VG_WRAP_FUNCTION_ZZ(VG_Z_LIBPTHREAD_SONAME,zf) argl_decl;     \
+   ret_ty VG_WRAP_FUNCTION_ZZ(VG_Z_LIBPTHREAD_SONAME,zf) argl_decl      \
+   { return implf argl; }
+#endif
 #endif
 
 /**