treewide: remove PKG_INSTALL from CMake packages

It's already default with cmake.mk

Found with:

git grep PKG_INSTALL\: | cut -d ':' -f 1 | sort -u > ins
git grep cmake.mk | cut -d ':' -f 1 > cmake
comm -1 -2 ins cmake

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/libs/mbedtls/Makefile

@@ -87,8 +87,6 @@ This package contains mbedtls helper programs for private key and
 CSR generation (gen_key, cert_req)
 endef
 
-PKG_INSTALL:=1
-
 TARGET_CFLAGS += -ffunction-sections -fdata-sections
 TARGET_CFLAGS := $(filter-out -O%,$(TARGET_CFLAGS))
 

package/network/services/odhcpd/Makefile

@@ -19,7 +19,6 @@ PKG_MIRROR_HASH:=a0644d31f99f20e5c2cee74153b81a0c2eae9ebeb644662cc76b0984b44dd49
 PKG_MAINTAINER:=Hans Dedecker <dedeckeh@gmail.com>
 PKG_LICENSE:=GPL-2.0
 
-PKG_INSTALL:=1
 PKG_CONFIG_DEPENDS:=CONFIG_PACKAGE_odhcpd_$(BUILD_VARIANT)_ext_cer_id
 PKG_ASLR_PIE_REGULAR:=1
 

package/system/opkg/Makefile

@@ -26,8 +26,6 @@ PKG_CONFIG_DEPENDS += \
 	CONFIG_SIGNATURE_CHECK \
 	CONFIG_TARGET_INIT_PATH
 
-PKG_INSTALL:=1
-
 HOST_BUILD_DEPENDS:=libubox/host
 
 include $(INCLUDE_DIR)/package.mk