Merge pull request #7204 from dedeckeh/pr-perl-glibc

perl: fix compilation with glibc 2.27

lang/perl/patches/010-musl-compat.patch

@@ -1,11 +1,11 @@
 --- a/perl.c
 +++ b/perl.c
-@@ -286,7 +286,7 @@ perl_construct(pTHXx)
+@@ -303,7 +303,7 @@ perl_construct(pTHXx)
      PL_localpatches = local_patches;	/* For possible -v */
  #endif
  
 -#if defined(LIBM_LIB_VERSION)
-+#if defined(LIBM_LIB_VERSION) && (defined(__GLIBC__) || defined(__UCLIBC__))
++#if defined(LIBM_LIB_VERSION) && defined(__UCLIBC__)
      /*
       * Some BSDs and Cygwin default to POSIX math instead of IEEE.
       * This switches them over to IEEE.