CMake: use CMAKE_INSTALL_PREFIX for the install destination

Use the variable instead of "." for the install destination.
While they're equivalent, it's not discoverable where the value
for "." is set.

It also results in paths containing "/./", while valid isn't so nice
if the paths are copied from the terminal for use elsewhere.

source/creator/CMakeLists.txt

@@ -374,7 +374,7 @@ if(UNIX AND NOT APPLE)
   else()
     if(WITH_INSTALL_PORTABLE)
       set(TARGETDIR_VER ${BLENDER_VERSION})
-      set(TARGETDIR_TEXT .)
+      set(TARGETDIR_TEXT "${CMAKE_INSTALL_PREFIX}")
       set(TARGETDIR_LIB lib)
     else()
       set(TARGETDIR_VER share/blender/${BLENDER_VERSION})
@@ -391,9 +391,9 @@ elseif(WIN32)
     set(TARGETDIR_EXE ${CMAKE_INSTALL_PREFIX_WITH_CONFIG}/bpy)
   else()
     set(TARGETDIR_VER ${BLENDER_VERSION})
-    set(TARGETDIR_TEXT .)
-    set(TARGETDIR_LIB ./blender.shared)
-    set(TARGETDIR_EXE .)
+    set(TARGETDIR_TEXT "${CMAKE_INSTALL_PREFIX}")
+    set(TARGETDIR_LIB "${CMAKE_INSTALL_PREFIX}/blender.shared")
+    set(TARGETDIR_EXE "${CMAKE_INSTALL_PREFIX}")
   endif()
 elseif(APPLE)
   if(WITH_PYTHON_MODULE)
@@ -636,7 +636,7 @@ if(UNIX AND NOT APPLE)
   elseif(WITH_INSTALL_PORTABLE)
     install(
       TARGETS blender
-      DESTINATION "."
+      DESTINATION "${CMAKE_INSTALL_PREFIX}"
     )
 
     install(
@@ -644,13 +644,13 @@ if(UNIX AND NOT APPLE)
         ${CMAKE_SOURCE_DIR}/release/freedesktop/blender.desktop
         ${CMAKE_SOURCE_DIR}/release/freedesktop/icons/scalable/apps/blender.svg
         ${CMAKE_SOURCE_DIR}/release/freedesktop/icons/symbolic/apps/blender-symbolic.svg
-      DESTINATION "."
+      DESTINATION "${CMAKE_INSTALL_PREFIX}"
     )
 
     if(WITH_BLENDER_THUMBNAILER)
       install(
         TARGETS blender-thumbnailer
-        DESTINATION "."
+        DESTINATION "${CMAKE_INSTALL_PREFIX}"
       )
     endif()
 
@@ -664,7 +664,7 @@ if(UNIX AND NOT APPLE)
         PROGRAMS
         ${CMAKE_SOURCE_DIR}/release/bin/blender-launcher
         ${CMAKE_SOURCE_DIR}/release/bin/blender-softwaregl
-        DESTINATION "."
+        DESTINATION "${CMAKE_INSTALL_PREFIX}"
       )
 
       # Remove from old location, so existing builds don't start with software
@@ -1020,11 +1020,15 @@ elseif(WIN32)
       # on the build-bot does not support this endeavor.
       install(
         FILES ${CMAKE_CURRENT_BINARY_DIR}/\${CMAKE_INSTALL_CONFIG_NAME}/blender_public.pdb
-        DESTINATION .
+        DESTINATION "${CMAKE_INSTALL_PREFIX}"
         RENAME blender.pdb
       )
     else()
-      install(FILES $<TARGET_PDB_FILE:blender> DESTINATION . RENAME blender.pdb)
+      install(
+        FILES $<TARGET_PDB_FILE:blender>
+        DESTINATION "${CMAKE_INSTALL_PREFIX}"
+        RENAME blender.pdb
+      )
     endif()
   endif()
 
@@ -1245,14 +1249,14 @@ elseif(WIN32)
         install(
           FILES
             ${LIBDIR}/python/${_PYTHON_VERSION_NO_DOTS}/libs/python${_PYTHON_VERSION_NO_DOTS}.pdb
-          DESTINATION "."
+          DESTINATION "${CMAKE_INSTALL_PREFIX}"
           CONFIGURATIONS Release;RelWithDebInfo;MinSizeRel
         )
 
         install(
           FILES
             ${LIBDIR}/python/${_PYTHON_VERSION_NO_DOTS}/libs/python${_PYTHON_VERSION_NO_DOTS}_d.pdb
-          DESTINATION "."
+          DESTINATION "${CMAKE_INSTALL_PREFIX}"
           CONFIGURATIONS Debug
         )
       endif()
@@ -1350,7 +1354,7 @@ elseif(WIN32)
         ${LIBDIR}/audaspace/lib/audaspace.dll
         ${LIBDIR}/audaspace/lib/audaspace-c.dll
         ${LIBDIR}/audaspace/lib/audaspace-py.dll
-      DESTINATION "."
+      DESTINATION "${CMAKE_INSTALL_PREFIX}"
     )
   endif()
 
@@ -1371,7 +1375,7 @@ elseif(WIN32)
   if(WITH_BLENDER_THUMBNAILER)
     install(
       TARGETS BlendThumb
-      DESTINATION "."
+      DESTINATION "${CMAKE_INSTALL_PREFIX}"
     )
   endif()
 
@@ -1432,7 +1436,7 @@ elseif(APPLE)
 
   install(
     TARGETS blender
-    DESTINATION "."
+    DESTINATION "${CMAKE_INSTALL_PREFIX}"
   )
 
   install(
@@ -1747,7 +1751,7 @@ if(WIN32 AND NOT WITH_PYTHON_MODULE)
   install(
     TARGETS blender blender-launcher
     COMPONENT Blender
-    DESTINATION "."
+    DESTINATION "${CMAKE_INSTALL_PREFIX}"
   )
   set_target_properties(
     blender
@@ -1805,7 +1809,7 @@ endif()\n\
       if(WITH_INSTALL_PORTABLE)
         install(
           FILES ${CMAKE_CURRENT_BINARY_DIR}/blender.1
-          DESTINATION "."
+          DESTINATION "${CMAKE_INSTALL_PREFIX}"
         )
       else()
         # Manual page (only with `blender` binary).