python3: disable PGO building by default, can be enabled by setting PKGMK_PGO=true

python3/.signature

@@ -1,5 +1,5 @@
 untrusted comment: verify with /etc/ports/opt.pub
-RWSE3ohX2g5d/RvE+7q9s15wFsv6Vcw1eHK7jYf2c80J8nMZbvm2mVoEYx7jFkT3KqvxTufeD+zbG1iOdEJyEGtytEy5vOl9gQQ=
-SHA256 (Pkgfile) = b939b80425b5bbf08b778e3510092c113a3590734b27db76011025acdd4deff6
+RWSE3ohX2g5d/W6FfP7SWgN2ZoKQxuVRP2O2lE2PJrikcPczAmisd4kI5WobuOU5nHX8FmsfYASRasYHltwwxu3NTaT5MV9ATgc=
+SHA256 (Pkgfile) = 0839b25360733f7044003fe59f37b0e36355a31fd653bdadbb1d13d4621552b4
 SHA256 (.footprint) = 9357c204cf5a561b9da657ff11d4e312c1faff8ac8893ae13fa3bc366b5aeb8b
 SHA256 (Python-3.6.7.tar.xz) = 81fd1401a9d66533b0a3e9e3f4ea1c7c6702d57d5b90d659f971e6f1b745f77d

python3/Pkgfile

@@ -17,20 +17,21 @@ build() {
     rm -r Modules/_ctypes/{darwin,libffi}*
     rm -r Modules/_decimal/libmpdec
 
-    # PGO should be done with -O3
-    CFLAGS="${CFLAGS/-O2/-O3}"
+    if [ -n "${PKGMK_PGO}" ]; then
+        # PGO should be done with -O3
+        CFLAGS="${CFLAGS/-O2/-O3}"
 
-    # Speed up LTO
-    sed -i -e "s|-flto |-flto=4 |g" configure configure.ac
+        # Speed up LTO
+        sed -i -e "s|-flto |-flto=4 |g" configure configure.ac
+	PKGMK_PYTHON3='--with-lto --enable-optimizations '
+    fi
 
-    ./configure --prefix=/usr \
+    ./configure ${PKGMK_PYTHON3} --prefix=/usr \
 		--enable-shared \
                 --enable-ipv6 \
 		--enable-loadable-sqlite-extensions \
-		--enable-optimizations \
 		--with-computed-gotos \
 		--with-threads \
-		--with-lto \
 		--with-system-expat \
 		--with-system-ffi \
 		--with-system-libmpdec \