prebuild added to driver.makefile

This was added to follow the way E3 updated driver.makefile

It is used makefiles in submodules and can be added to conde build.sh

App/tools/driver.makefile

@@ -56,6 +56,8 @@
 #    EPICS versions to skip. Usually 3.13 or 3.14
 # ARCH_FILTER
 #    Sub set of architectures to build for, e.g. %-ppc604
+# prebuild
+# Added a `prebuild` target that runs before build so module developers can run specific code before the build process.
 
 # Get the location of this file.
 MAKEHOME:=$(dir $(lastword ${MAKEFILE_LIST}))
@@ -117,6 +119,9 @@ ENV=
 # Don't install anything (different from default EPICS make rules).
 default: build
 
+# Added to follow E3
+prebuild:
+
 IGNOREFILES = .cvsignore .gitignore
 %: ${IGNOREFILES}
 ${IGNOREFILES}: