Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/docs/INSTALL.MAC

Index: third_party/freetype2/src/docs/INSTALL.MAC
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+Please follow the instructions  in INSTALL.UNIX to install FreeType on
+Mac OS X.
+
+Currently FreeType2 functions based on some deprecated Carbon APIs
+return FT_Err_Unimplemented_Feature always, even if FreeType2 is
+configured and built on the system that deprecated Carbon APIs are
+available. To enable deprecated FreeType2 functions as far as possible,
+replace src/base/ftmac.c by builds/mac/ftmac.c.
+
+Starting with Mac OS X 10.5, gcc defaults the deployment target
+to 10.5. In previous versions of Mac OS X, this defaulted to 10.1.
+If you want your built binaries to run only on 10.5, this change
+does not concern you.  If you want them to also run on older versions
+of Mac OS X, then you must either set the MACOSX_DEPLOYMENT_TARGET
+environment variable or pass -mmacosx-version-min to gcc. You should
+specify the oldest version of Mac OS you want the code to run on.
+For example, if you use Bourne shell:
+
+	export MACOSX_DEPLOYMENT_TARGET=10.2
+
+or, if you use C shell:
+
+	setenv MACOSX_DEPLOYMENT_TARGET 10.2
+
+Alternatively, you could pass "-mmacosx-version-min=10.2" to gcc.
+
+Here the number 10.2 is the lowest version that the built binaries
+can run on. In the cases in above, the built binaries will run on
+Mac OS X 10.2 and later, but _not_ earlier. If you want to run on
+earlier, you have to set lower version, e.g. 10.0.
+
+For classic Mac OS (Mac OS 7, 8, 9) please refer to builds/mac/README.