merge revision(s) 0168094,cdef17096c03099f17ecf0af51f43faa0944f96d,b7…

…d86e330c76b4f9615511307e1c40f4f2937c83:

	Use libSystem.dylib instead of libm.dylib and libc.dylib

	  Because macOS 11.0(Big Sur) was removed libc and libm from `/usr/lib`.

	libSystem.dylib is also symlink. Use libSystem.B.dylib

	Workaroud for macOS Big Sur(11.0)

test/fiddle/helper.rb

@@ -43,8 +43,7 @@
   crtname = RbConfig::CONFIG["RUBY_SO_NAME"][/msvc\w+/] || 'ucrtbase'
   libc_so = libm_so = "#{crtname}.dll"
 when /darwin/
-  libc_so = "/usr/lib/libc.dylib"
-  libm_so = "/usr/lib/libm.dylib"
+  libc_so = libm_so = "/usr/lib/libSystem.B.dylib"
 when /kfreebsd/
   libc_so = "/lib/libc.so.0.1"
   libm_so = "/lib/libm.so.1"
@@ -111,6 +110,11 @@
 libc_so = nil if !libc_so || (libc_so[0] == ?/ && !File.file?(libc_so))
 libm_so = nil if !libm_so || (libm_so[0] == ?/ && !File.file?(libm_so))
 
+# macOS 11.0+ removed libSystem.B.dylib from /usr/lib. But It works with dlopen.
+if RUBY_PLATFORM =~ /darwin/
+  libc_so = libm_so = "/usr/lib/libSystem.B.dylib"
+end
+
 if !libc_so || !libm_so
   ruby = EnvUtil.rubybin
   # When the ruby binary is 32-bit and the host is 64-bit,

version.h

@@ -2,7 +2,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 2
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 136
+#define RUBY_PATCHLEVEL 137
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 10