Bump version for v3.1.0 release on RB-3.1 branch (#1099)

Per https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html:

* Source code has changed, interfaces have changed (e.g. 3_1 namespaces):
  soversion goes from 29.0.0 to 30.0.0.

Also, bump IMATH_TAG to v3.1.1.

Signed-off-by: Cary Phillips <[email protected]>

Author: cary-ilm

CMakeLists.txt

@@ -21,7 +21,7 @@ endif()
 
 project(OpenEXR VERSION 3.1.0 LANGUAGES C CXX)
 
-set(OPENEXR_VERSION_RELEASE_TYPE "-dev" CACHE STRING "Extra version tag string for OpenEXR build, such as -dev, -beta1, etc.")
+set(OPENEXR_VERSION_RELEASE_TYPE "" CACHE STRING "Extra version tag string for OpenEXR build, such as -dev, -beta1, etc.")
 
 set(OPENEXR_VERSION ${OpenEXR_VERSION})
 set(OPENEXR_VERSION_API "${OpenEXR_VERSION_MAJOR}_${OpenEXR_VERSION_MINOR}")
@@ -43,7 +43,7 @@ set(OPENEXR_VERSION_API "${OpenEXR_VERSION_MAJOR}_${OpenEXR_VERSION_MINOR}")
 #   2. API added:     CURRENT+1.0.AGE+1
 #   3. API changed:   CURRENT+1.0.0
 #
-set(OPENEXR_LIBTOOL_CURRENT 29)
+set(OPENEXR_LIBTOOL_CURRENT 30)
 set(OPENEXR_LIBTOOL_REVISION 0)
 set(OPENEXR_LIBTOOL_AGE 0)
 set(OPENEXR_LIB_VERSION "${OPENEXR_LIBTOOL_CURRENT}.${OPENEXR_LIBTOOL_REVISION}.${OPENEXR_LIBTOOL_AGE}")

cmake/OpenEXRSetup.cmake

@@ -253,7 +253,7 @@ option(OPENEXR_FORCE_INTERNAL_IMATH "Force using an internal imath" OFF)
 # Check to see if Imath is installed outside of the current build directory.
 set(IMATH_REPO "https://github.com/AcademySoftwareFoundation/Imath.git" CACHE STRING
     "Repo for auto-build of Imath")
-set(IMATH_TAG "master" CACHE STRING
+set(IMATH_TAG "v3.1.1" CACHE STRING
   "Tag for auto-build of Imath (branch, tag, or SHA)")
 if(NOT OPENEXR_FORCE_INTERNAL_IMATH)
   #TODO: ^^ Release should not clone from master, this is a place holder