Update with changes from 0.3.7

Changelog.txt

@@ -1,4 +1,46 @@
 OpenBLAS ChangeLog
+====================================================================
+Version 0.3.7
+11-Aug 2019
+
+common:
+        * having the gmake special variables TARGET_ARCH or TARGET_MACH
+          defined no longer causes build failures in ctest or utest
+        * defining NO_AFFINITY or USE_TLS to 0 in gmake builds no longer
+          has the same effect as setting them to 1
+        * a new test program was added to allow checking the library for
+          thread safety
+        * a new option USE_LOCKING was added to ensure thread safety when
+          OpenBLAS itself is built without multithreading but will be 
+          called from multiple threads.
+        * a build failure on Linux with glibc versions earlier than 2.5
+          was fixed
+        * a runtime error with CPU enumeration (and NO_AFFINITY not set)
+          on glibc 2.6 was fixed
+        * NO_AFFINITY was added to the CMAKE options (and defaults to being
+          active on Linux, as in the gmake builds)
+
+x86_64:
+        * the build-time logic for detection of AVX512 availability in
+          the processor and compiler was fixed
+        * gmake builds on OSX now set the internal name of the library to 
+          libopenblas.0.dylib (consistent with CMAKE)
+        * the Haswell DGEMM kernel received a significant speedup through
+          improved prefetch and load instructions
+        * performance of DGEMM, DTRMM, DTRSM and ZDOT on Zen/Zen2 was markedly
+          increased by avoiding vpermpd instructions
+        * the SKYLAKEX (AVX512) DGEMM helper functions have now been disabled
+          to fix remaining errors in DGEMM, DSYMM and DTRMM
+
+## POWER:
+        * added support for building on FreeBSD/powerpc64 and FreeBSD/ppc970
+        * added optimized kernels for POWER9 SGEMM and STRMM
+
+## ARMV7:
+        * fixed the softfp implementations of xAMAX and IxAMAX
+        * removed the predefined -march= flags on both ARMV5 and ARMV6 as
+          they were appropriate for only a subset of platforms
+
 ====================================================================
 Version 0.3.6
 29-Apr-2019