package/: fix $(PROJECT_GIT) usage

Signed-off-by: John Crispin <john@phrozen.org>

package/network/config/firewall/Makefile

@@ -12,7 +12,7 @@ PKG_NAME:=firewall
 PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=$(PROJECT_GIT)/project/firewall3.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/firewall3.git
 PKG_SOURCE_DATE:=2018-08-13
 PKG_SOURCE_VERSION:=1c4d5bcd1137e61e91dca858fe33d76d7a1dc821
 PKG_MIRROR_HASH:=49f939877a734056455556c90b959c407fd2c4988dc5d86f62a8122ebd7b8899

package/system/fstools/Makefile

@@ -11,7 +11,7 @@ PKG_NAME:=fstools
 PKG_RELEASE:=3
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=$(PROJECT_GIT)/project/fstools.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/fstools.git
 PKG_SOURCE_DATE:=2018-05-23
 PKG_SOURCE_VERSION:=dd02dad332958575cc52e60c78ef10ef2b5aaced
 PKG_MIRROR_HASH:=31051da29a0fff0b60ab3fc7fe27be281ed298346ff0ac65e3a2976671d2deed

package/system/procd/Makefile

@@ -11,7 +11,7 @@ PKG_NAME:=procd
 PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=$(PROJECT_GIT)/project/procd.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/procd.git
 PKG_SOURCE_DATE:=2018-08-06
 PKG_SOURCE_VERSION:=e29966f04cdf549a01f721f93634672055da8af4
 PKG_MIRROR_HASH:=f02b74df25025b0299181f9ed03aa04092c00a047f5976d91305a0e98c132829

package/utils/usbmode/Makefile

@@ -4,7 +4,7 @@ PKG_NAME:=usbmode
 PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=$(PROJECT_GIT)/project/usbmode.git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/usbmode.git
 PKG_SOURCE_DATE:=2017-12-19
 PKG_SOURCE_VERSION:=f40f84c27534159066c94dadc0c08e0b255c3e26
 PKG_MIRROR_HASH:=840c7ee2843102b09d8943a20820025251cc259385e2b0bde6b7c8cce8190f83