Fix issue with runtime.build_os and runtime.build_architecture (AcademySoftwareFoundation#623)

### Fix issue with runtime.build_os and runtime.build_architecture

### Linked issues
n/a

### Summarize your change.
Add missing compiler definitions for MacOS and Linux. There are some
unrelated changes because of the pre-commit hook.

### Describe the reason for the change.
The command build_os and build_architecture were returning empty strings
on Linux.

### Describe what you have tested and on which operating system.
Rocky 8

Signed-off-by: Cédrik Fuoco <[email protected]>

Author: cedrik-fuoco-adsk

cmake/defaults/rv_targets.cmake

@@ -9,20 +9,23 @@ SET(CMAKE_SKIP_RPATH
 )
 
 IF(APPLE)
-  # Only native builds are supported (x86_64 on Intel MacOS and ARM64 on Apple chipset).
-  # Rosetta can be used to build x86_64 on Apple chipset.
+  # Only native builds are supported (x86_64 on Intel MacOS and ARM64 on Apple chipset). Rosetta can be used to build x86_64 on Apple chipset.
   IF("${CMAKE_HOST_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
     SET(RV_TARGET_APPLE_X86_64
         ON
         CACHE INTERNAL "Compile for x86_64 on Apple MacOS" FORCE
     )
-    SET(__target_arch__ -DRV_ARCH_X86_64)
+    SET(__target_arch__
+        -DRV_ARCH_X86_64
+    )
   ELSEIF("${CMAKE_HOST_SYSTEM_PROCESSOR}" STREQUAL "arm64")
     SET(RV_TARGET_APPLE_ARM64
         ON
         CACHE INTERNAL "Compile for arm64 on Apple MacOS" FORCE
     )
-    SET(__target_arch__ -DRV_ARCH_ARM64)
+    SET(__target_arch__
+        -DRV_ARCH_ARM64
+    )
   ENDIF()
 
   MESSAGE(STATUS "Building for ${CMAKE_HOST_SYSTEM_PROCESSOR}")
@@ -44,6 +47,11 @@ IF(APPLE)
       CACHE STRING "Platform identifier used in Tweak Makefiles"
   )
 
+  SET(ARCH
+      "${CMAKE_HOST_SYSTEM_PROCESSOR}"
+      CACHE STRING "CPU Architecture identifier"
+  )
+
   SET(CMAKE_MACOSX_RPATH
       ON
   )
@@ -107,6 +115,16 @@ ELSEIF(UNIX)
     -DPLATFORM_OPENGL=1
   )
 
+  SET(PLATFORM
+      "LINUX"
+      CACHE STRING "Platform identifier"
+  )
+
+  SET(ARCH
+      "IA32_64"
+      CACHE STRING "CPU Architecture identifier"
+  )
+
   EXECUTE_PROCESS(
     COMMAND cat /etc/redhat-release
     OUTPUT_VARIABLE RHEL_VERBOSE
@@ -150,4 +168,4 @@ ELSEIF(WIN32)
 ELSE()
   MESSAGE(FATAL_ERROR "Unsupported platform")
 
-ENDIF()
+ENDIF()