cpupower: Improve Python binding's Makefile

JIRA: https://issues.redhat.com/browse/RHEL-91191

Upstream Status: git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit b74710e
Author: John B. Wyatt IV <jwyatt@redhat.com>
Date:   Tue Jun 24 16:41:04 2025 -0400

    cpupower: Improve Python binding's Makefile

    Add a few build variables to make it easier for distributions to
    package the bindings. Allow current variables to be overwritten by
    environment variables that are passed to make.

    CCing Thorsten Leemhuis <linux@leemhuis.info>.

    https://lore.kernel.org/r/20250624204105.457971-1-jwyatt@redhat.com
    Signed-off-by: John B. Wyatt IV <jwyatt@redhat.com>
    Signed-off-by: John B. Wyatt IV <sageofredondo@gmail.com>
    Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Signed-off-by: John B. Wyatt IV <jwyatt@redhat.com>

Author: John B. Wyatt IV

tools/power/cpupower/bindings/python/Makefile

@@ -4,20 +4,22 @@
 # This Makefile expects you have already run `make install-lib` in the lib
 # directory for the bindings to be created.
 
-CC := gcc
+CC ?= gcc
+# CFLAGS ?=
+LDFLAGS ?= -lcpupower
 HAVE_SWIG := $(shell if which swig >/dev/null 2>&1; then echo 1; else echo 0; fi)
 HAVE_PYCONFIG := $(shell if which python-config >/dev/null 2>&1; then echo 1; else echo 0; fi)
 
-PY_INCLUDE = $(firstword $(shell python-config --includes))
-INSTALL_DIR = $(shell python3 -c "import site; print(site.getsitepackages()[0])")
+PY_INCLUDE ?= $(firstword $(shell python-config --includes))
+INSTALL_DIR ?= $(shell python3 -c "import site; print(site.getsitepackages()[0])")
 
 all: _raw_pylibcpupower.so
 
 _raw_pylibcpupower.so: raw_pylibcpupower_wrap.o
-	$(CC) -shared -lcpupower raw_pylibcpupower_wrap.o -o _raw_pylibcpupower.so
+	$(CC) -shared $(LDFLAGS) raw_pylibcpupower_wrap.o -o _raw_pylibcpupower.so
 
 raw_pylibcpupower_wrap.o: raw_pylibcpupower_wrap.c
-	$(CC) -fPIC -c raw_pylibcpupower_wrap.c $(PY_INCLUDE)
+	$(CC) $(CFLAGS) $(PY_INCLUDE) -fPIC -c raw_pylibcpupower_wrap.c
 
 raw_pylibcpupower_wrap.c: raw_pylibcpupower.swg
 ifeq ($(HAVE_SWIG),0)