Makefile.install: fix PKGFILE so it works with paths with spaces

Note that the second setting of PKGFILE, at line 194, is redundant because that line was treated as a shell command which only assigned the variable for that line's invocation.

Author: Sid-MB

Makefile.install

@@ -32,7 +32,7 @@ PKG_EXTRALIB := $(EXTRALIB)
 ifeq ($(INTERFACE64),1)
 	SUFFIX64=64
 endif
-PKGFILE="$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE)$(SUFFIX64).pc"
+PKGFILE := $(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE)$(SUFFIX64).pc
 
 ifeq ($(USE_OPENMP), 1)
   ifeq ($(C_COMPILER), PGI)
@@ -191,8 +191,6 @@ endif
 ifeq ($(INTERFACE64),1)
 	SUFFIX64=64
 endif
-	PKGFILE="$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)/$(LIBSONAMEBASE)$(SUFFIX64).pc"
-
 	@echo Generating $(LIBSONAMEBASE)$(SUFFIX64).pc in "$(DESTDIR)$(OPENBLAS_PKGCONFIG_DIR)"
 	@echo 'libdir='$(OPENBLAS_LIBRARY_DIR) > "$(PKGFILE)"
 	@echo 'libprefix='$(LIBNAMEPREFIX) >> "$(PKGFILE)"